Now you've piqued my interest, especially if it could be done in a safe but distributed way, without a focus on profits.
How you'd envision it to work, considering the open nature of ActivityPub but the need/want from the users to remain private when using dating applications/protocols?
Profile data can be restricted based on authorized fetch, just like mastodon.
For messaging, I hadn’t put a much thought into it, but one could establish end to end encryption based on mutual validation signatures. Theoretically. Encryption isn’t my strong suit, but as long as the encoded body is unicode, it’s just as easy to transmit as any other text.
But, like, I also don’t know of any dating site that professes to be encrypting message contents.