Isn't this the hidden hand of Adam Smith? If FAANGT doesn't ban/remove the fascists then they face huge commercial pressure - if they do then the commercial pressure (from the other side) is much less. The market is speaking - the CEO's of these companies have decided that the tide has turned and it's in their shareholder's interest to ban.

I think this is a terrible way to run society - no company should have the scale or power of these companies, but it turns out that this is what can happen if you run things by a market. To argue that they shouldn't do this is basically arguing against a market economy!