The user is aware of the ban on advertising mixers, but still put on the signature.

Does this deserve a ban on wearing a signature?

It's an edge case, but as things stand now I think that putting BitMixList in a signature is more like sending somebody to https://www.google.com/search?q=mixers than promoting a certain mixer. So I'll allow it. This could change if for example BitMixList puts a big banner for a specific mixer on the top of its page, or if the signature text said "Click here to get the link to the best new mixer, MixerABC!", or if forum users end up somehow being indirectly paid by mixers via BitMixList, etc.

Thanks.