Yes. You'll get a message saying that "you're posting too fast." That's because you've been limited to only a few (four or five) posts per hour. You'll never be told when this is applied to your account, or what the limit is, or when it's lifted, if it is. They also used to purposely slow response times as a way to drive certain posters away but I think they've stopped that. They also shadowban, but at least that's reversible. Unless you vouch for the wrong people, then you lose your vouching privileges.

Basically, the mods will tweak anything and everything they can to either increase the quality of your comments or decrease the damage they do, with banning outright as a last resort.