Above I gave only an example of what it looks like if someone were to share a bitlist.co link on that network. I wouldn't go into the usefulness of that here, although I often got better results from there than from "crypto-friendly" Twitter. I'm talking from the aspect of push site traffic.
Is it logical that someone wants privacy on FB, probably not, but I would not ignore the millions of users of that network.
Finally, in addition to the collection of mixers, Bitlist.co has listed casinos, debit cards, exchanges and other services. It is not exclusively focused on mixers.