While I do think Twitter is basically done as a serious open source contributor, there was one final comment that I kinda wish had been included:

"But on the other hand, open source is designed to be resilient. The fact that we can be grateful to the amazing Tweeps that have contributed over the years, and then fork the project and give it new life without Twitter, is open source working exactly as intended."

I'm very optimistic those projects can find new homes.

https://www.zdnet.com/article/twitter-turns-its-back-on-open-source-development/

Twitter turns its back on open-source development

Besides firing most of Twitter's technical staff, new owner and CEO Elon Musk has dropped support for Twitter's open-source efforts.

ZDNET

@will bootstrap was the first thing that came to my mind — but I wonder how much material support Twitter was still giving them even before all of this? or is it actually 100% officially spun off?

twemoji has also been impressively well maintained in terms of unicode spec parity till now, and is also way more popular than many would think (hint: the default Mastodon emojis had to come from somewhere!)

either way, this news is just plain unfortunate all around. 😕

@jake bootstrap was a great Twitter open source success story, but it spun out many years ago.

Twemoji was down to basically one engineer doing all of the maintenance work, and they left last month. Like so many other projects, I expect twemoji will just freeze in it's current state.

I'd love to be proven wrong, but don't think I will be.