For the record: I don't know if "shut down" is the optimal outcome. Credible moderation --- "no appeals to violence" --- would take it from dangerous to mere odiousness. But I don't know that anyone has a right to demand any private business host odious content, either.

But it's Parler's problem that they've hit this point with so little time to build credible moderation, not anybody else's. Me sowing, me reaping, &c &c.