I've been the founders in this situation. Go to the founders. It sounds like they tried to hire a Bad Guy TM to get things "under control" and that person is no

I've been the founders in this situation. Go to the founders. It sounds like they tried to hire a Bad Guy TM to get things "under control" and that person is now too controlling now that context has been built and people have leveled up. Your feelings and frustrations are valid. If they are good founders, they'll deal with this person. If not, leave.