One of the things I prefer about mastodon over Twitter is when you delete a post, media is actually going to be deleted. Not stored anyways but not shown anymore...

At least I suppose so by the slogan.

Still in my opinion Twitter got the higher potential. Altough, with some kind of recommendations algorithm and more advertising mastodon could grow to a real competitor.
In fact mastodon is far better then threads or bluesky in mho.
Just more features and reliability.
Threads and bluesky is just hyped currently.