It's labor cost. There is, historically, never enough moderation capability to go around to start duplicating the effort: that's why Reddit can have a "moderato

It's labor cost. There is, historically, never enough moderation capability to go around to start duplicating the effort: that's why Reddit can have a "moderator strike". A solution that rests on choosing who curates you most likely means you have the labor-saving technology for an AI to do the curation based on a prompt, in which case, you can jump to that solution.