So now engineers working on the algo can ensure their launches won't lower Elon's tweet visibility. Looks like those remaining at Twitter have a knack for corporate survival.
Companies can't revoke visas of employees... That's just not how H1B Visas work. Yes they can be fired, but they can go find another job and keep the Visa.
Can they? I don't know, but I imagine that at this point, everyone still working for Twitter is there because they don't have any other realistic option.
It's harder with visas, because you're not gambling if you can find another job, you're gambling if your employer can acquire a visa in time for you to not be deported.
With forced RTO and "hardcore" mandates, it's difficult to find 6+ hours of time to interview at other companies (assuming there are any open visa sponsorships available).