For what it's worth, yes, I would still argue that ISIS recruitment videos should be allowed on the internet. (But I could see my future self renouncing this as immature and un-nuanced.) Because in general, I am more afraid of overreaction to terrorism than terrorism itself.

That's true that there are alternatives to CF. As long as there is at least one anti-DDoS provider with an "everyone is welcome" attitude, I suppose CF can do whatever they want. So I'll concede that point.