To add to what I said above, I think someone might have asked this question before a very long time ago and if I remember correctly theymos even commented on it if someone wants to do some digging to see what he said.
Yobit and Cryptotalk had their signature campaign to shill Cryptotalk forum in
2019. Because initially it was a spam campaign, Bitcointalk community reacted to it and yahoo took over the campaign to clean spammers from participant list.
theymos even banned the Yobit account here because of abuse and some spammers from that campaign but eventually, he allowed Cryptotalk forum to advertise here via a signature campaign under yahoo62278.
129 users who were wearing a yobit signature and had at least 1 good report against them in the last 14 days are banned for 14 days. All yobit signatures are wiped. Signatures containing "yobit.net" are banned for 60 days.
Some people were talking about neg-trusting spammers for spamming. This is not appropriate; report the posts, and if that doesn't seem to be working well, come to Meta with specific examples and suggestions.