A better comparison would be that if a car company can’t meet preexisting crash/safety standards, they need to shut down.

These are pretty clear laws established by a democratic government with a pretty good record for rule of law.

Sure, then they can go demand said standards for social media platforms including expected amount per N post, just as car companies are not expected to have car fatality rates be 0.

The fact is that simple scale means that there will always be something, no matter how abhorrent. Small scale doesn't change this, it just concentrates it.