How often do you genuinely discuss mixers with direct links and names being named? I'm actually curious. Without it being related to Signature Campaigns, it's surely not that widely discussed since a majority of "normal" users on bitcointalk barely know about self custody.
Do a search in ninjastic and you will see general statistics for that.
Again, I will repeat this, according to new rules any service without kyc verification can be considered as a mixer, so better think about that.
Anything that increases Privacy can also be considered as a mixer, now that can easily be considered coinjoin, joinmarket, maybe even Lightning Network.
In general we should not mention anything about privacy anymore.