@lnxw37a2 Yes you're right! This was written in hasty excitement to get something put up, I think I'll put this on some wiki or guide or more permanent place where it can stay updated and everyone can edit it

You're right, I'm certain 97%+ of fedi admins never do, but pawoo and mastodon.social already feed data to advertisers, who's to say they wouldn't feed DMs? I don't think they do, but it would be very easy.