WOW. Elon Musk's Twitter straight-up banned the account for Mastodon. Just, wow.
From what it seems, this is likely related to the Elon Jet following account that was banned on Twitter and then went to Mastodon 🙃 because they mentioned it.

This is the account Elon said previously he wouldn't ban, then did and so banned Mastodon because they mentioned it - educated guess here.

https://www.theguardian.com/technology/2022/dec/14/twitter-elon-musk-private-jet-account-suspended

Twitter suspends account monitoring Elon Musk’s flight paths

Musk had vowed to allow @ElonJet to post but then declared accounts that listed real-time location data would be suspended

The Guardian
And now he’s banning a ton of journalists. Uh oh.
@gamingonlinux His empire is crumbling, and we're watching it in real time.
@gamingonlinux got his own little virtual banana republic going, doesn't he?
@gamingonlinux other than Mastodon what journalists?
@gamingonlinux he's a "14yr old forum admin on a power trip" is becoming way too accurate....
@gamingonlinux yup. Which finally prompted me to post my "goodbye" message to my account. Took several tries, though, because even having "mastodon.social" – as us or part of a URL – resulted in post being blocked. Had to change to "mastodon-dot-social" to get the point across. Surprised I was able to update my profile to include my Mastodon account info.
@gamingonlinux this was it for me. I jumped ship and deactivated my account.
@gamingonlinux Honestly waiting for twitter to explode from within now. Elon is like Vince Russo when he joined WCW, it almost time for Twitter to face the same fate.
@gamingonlinux most sane social media, space travel and carmaker CEO.
@gamingonlinux wait...,
elon was here? fascinating.
@gamingonlinux yes, like always he creates the rule on the spot
https://twitter.com/elonmusk/status/1603181423787380737
Elon Musk on Twitter

“Any account doxxing real-time location info of anyone will be suspended, as it is a physical safety violation. This includes posting links to sites with real-time location info. Posting locations someone traveled to on a slightly delayed basis isn’t a safety problem, so is ok.”

Twitter
@gamingonlinux Elon Musk uses conspiracy theories to manipulate people into authoritarianism. People see him as a strong man who is protecting their freedom. The German people saw Hitler as a strong man who was protecting their freedom. Elon just banned Keith Olbermann and a dozen other journalists. Just like Hitler, Elon spreads a fake sense of freedumb and liburty.
@gamingonlinux it’s more than that - twitter users can’t even put their mastodon link in their bio anymore - Twitter is labelling it as malware or unsafe. Manchild syndrome coming to the fore
@gamingonlinux the so called free speech
@riiku @gamingonlinux Nothing to see here, it's just peak capitalism
@gamingonlinux so much for free speech and markets

@gamingonlinux

Yesterday it was public ADS-B data because it's considered "doxxing" (Later on posting a license plate asking for people to identify it 🙄)

Today it's banning any other platforms from having an account on Twitter. I wonder which part of the policy he's created (in his shallow egotistical mind) for this to be allowed.

Free speech eh?

@gamingonlinux Not just them also @stux got removed as well.
@GeeksLoveDetail @gamingonlinux @stux I believe stux deleted his account. When you deactivate your account, it says "This account doesn't exist."
@peterbutler @gamingonlinux @stux yeah, he did now. Before that stux had shared that it had temporarily gotten suspended.

@gamingonlinux and I have banned the blue bird from my live  

Mastodon is a such more friendly site 

@gamingonlinux This happened earlier, because joinmastodon.com really was a spamming site, the original site is .org. Then the .com was given to .org, now both are ok, but Twitter still bans it. So this seems not to be a typical Musk move, as far as I read somewhere.

@aus_der_UBahn @gamingonlinux No, this is new, the last archive prior to today has it unsuspended https://web.archive.org/web/20221211201332/https://twitter.com/joinmastodon

The domain thing is something else.

Mastodon (@[email protected]) (@joinmastodon) / Twitter

Mastodon is the largest decentralized social network on the internet. Built on open web standards by a non-profit. Learn more on our website!

Twitter
@gamingonlinux @GregMorenz Ah, ok, that‘s really bad news then…
@gamingonlinux I think, he is in full rage mode now. Bad press? He doesn’t care anymore. After his prosecute/Fauci and other extrem right-wing tweets, he thinks banning Mastodon’s promo account will have even less public effect on him.
Tweet / Twitter

Twitter
@ytvwld @gamingonlinux You are linking to a banned account.
Mastodon (@[email protected]) on Twitter

“Did you know? You can follow @ElonJet on Mastodon over at https://t.co/r6TBUTJRf4 ✈️”

Twitter
Mastodon (@[email protected]) on Twitter

“Did you know? You can follow @ElonJet on Mastodon over at https://t.co/r6TBUTJRf4 ✈️”

Twitter
@gamingonlinux @donmelton is it really surprising that twitter’s owner is so shallow that he can’t have anything that could slightly hurt his fragile ego?
@gamingonlinux holy smokes!!! Did Twitter JUST Ban a competitor from their own platform. talk about Killing the competition's outreach.

@gamingonlinux Nothing that this pathetic narcissistic loser does surprises or shocks me any more ...

#ElonSucks #Twitter #Mastodon #MuskIsAScumbag

sounds like it was related to the account tweeting about following the elonjet info on mastodon

#^https://web.archive.org/web/20221215173935/https://twitter.com/joinmastodon
Mastodon (@[email protected]) (@joinmastodon) / Twitter

Mastodon is the largest decentralized social network on the internet. Built on open web standards by a non-profit. Learn more on our website!

Twitter
@gamingonlinux Exactly why I just signed up! What possible real is the ban valid?
@gamingonlinux That’s just some account some person gave that name.
@gamingonlinux Maybe the mastodon should have posted more right wing conspiracy theories not to get banned