Ultimately if someone with guns and tanks decides to deplatform you, it’s happening unless you can get your own guys with guns and tanks to protect you.

Anything can be de-platformed.

ISPs and other networks could in theory refuse to peer with them.

But from what we’ve seen in the past their behaviour would have to be especially egregious for this to be even contemplated.

Also, our economy might not be able to handle the spike in productivity if it were to go away.

Market entrenchment is an unfortunate side effect. The oligopolistic old guard can weather or ignore such criticism against themselves and lobby for their own Section 230 protections, while using such to eliminate small market entrants.