If you aren't vaccinated, you are fired because the government has mandated it. If you don't leave, you're trespassing and the police will most certainly going to be involved.

But in general, American oligarchs have figured out that private enterprise is a good way to circumvent constitutional and legal limits to their power.

This is also how the surveillance state came into existence. BigTech is a de facto arm of the government while maintaining legal separation. It does the dirty work because it doesn't have to play by the same rules government must. As naive libertarians like to say, it's private so it's all consensual so it's cool, man.