Do you have an actual argument, or is your view simply that it's not restricting free speech if it's bad speech?

It is the frequent brigading by the Donald sub that makes free speech argument sound hollow. That sub was not banned for supporting president or discussing politics, it was banned because it became nuisance too people who wanted to discuss their own things.

> Freedom of speech is about legality

It can often be about legality but it is absolutely not limited to that.