Does theymos have a patent for signature campaign such that no other forum can replicate what is happening here without his permission.
Adding a promotional ad or anything to the profile signature on the forum has always existed. That is, since forum scripts like SMF, Phpbb, ... were created. A suitable ground for making campaigns out of it is Bitcoin and the simplicity of paying many participants while keeping everything "anonymous".
Imagine how complicated it would be for a biker forum to introduce a signature promotion/campaign. Which payment method would they choose?