The good/unique passwords stuff is crazy. Almost all of these happen because of a system backdoor or spoofing an admin. I can’t recall any big breaks we’re adding more $! To a password would have changed the outcome.
Maybe this sort of “dna relative” service shouldn’t exist, because anyone who opts into it is implicitly putting faith in the password safety of everybody they’ve been matched with. But, I dunno, at least I don’t see this as explicitly evil on 23AndMe’s part.