You mean like Bluesky, Threads, or Mastodon?

Those services are available, however, people would not stop using Twitter and will continue to do so until we stop consuming their content, then maybe they will finally get off Twitter...

It's companies. Corporate PR accounts never migrate off to Mastodon/Bluesky/Threads. Many neglects update of updates pages, announcing everything on Twitter.

Some of them would move to Instagram if it makes sense to do so, but Twitter apparently makes the best ad ROI figures among Twitter-like services.

a few companies (mainly those in the open-source space) run their own Mastodon instances, though this is more common for FOSS organisations

As far as I'm concerned, Corporate PR can stay nicely fenced off over on Xitter.

Keep all the bullshit in one far corner, over there, in the distance, behind the big wall, topped with razor wire.

I mean, lots of local and/or small services announce disruptions on Twitter only. Many of those have separate news/service status pages on WWW, and yet neglects updates of those. Possibly because users without access to Twitter aren't worth informing.

IOW, Twitter still is a social data infrastructure, like road or tap water. Something that the society depends on, that also ain't nobody paying for it, something that only makes sense at-cost max or at a loss.

I think that was always a fundamental problem with Twitter as a for-profit company. Surely it handles a large amounts of important communications, that are also not so exploitable or monetizable, ethically or not, just fundamentally.

It's so simple and straightforward, and that's why Douglas Crockford claims he "discovered" it, rather than invented it.