Which platform has removed questioning of lockdown measures? I see these debates happening daily here, on Twitter, on Facebook, on reddit, and in the mainstream media.

Interesting how this person who was apparently complaining about being oppressed now oppressed himself. Like that comic about the guy sticking a rod in his own wheel.

At least, individual Reddit moderators remove them (I have first hand experience). I've heard reports of removals on many platforms.

It varies by subreddit. It's basically whatever the mods want to allow.