Some other scenarios is more regulations from governments, to block advertisements of gambling companies in the forum. It sounds to much, but who knows, or they just ask KYC as a mandatory condition to work in signature campaign.
Or they might find a better platform (in terms of viewership), I'm seeing more of these ads at sporting events.
Or theymos, the forum head admin, or any head admin after him, will shut down signature campaign industry in the forum. It's possible.
There was warning in the past about it.
Much water has flown under the bridge, I don't think these ideas are valid now or signature campaigns may soon be banned.