That's a fair point about removing signatures for people with a certain negative trust that could work. Other forums don't have the traffic that this forum does have so it's going to have a lot more spam than other forums.
I don't think theymos cares about the revenue that much. I base this on the fact that he doesn't allow ICOs to advertise on the forum anymore.
Yeah but that's probably because of moral reasons and how most of them are scams.