I've seen this user actively posting using yobit signature, I would like to know how they bypass the signature ban. This one as well, https://bitcointalk.org/index.php?topic=5138339.msg50861221#msg50861221 , he is wearing a hero signature, they must do some kind of trick or there's a new update that we are not aware of.
It's probably because the ban has been lifted for specific users. That particular user had a ban massage showing on his signature a few hours earlier one but now it's showing a yobit signature again.