How about empathy for the other people they'll make miserable if you encourage their worldview , and maybe the people they'll make miserable if you further embitter them?
To be clear, I don't think the law should tolerate scams of this kind, or that policy should encourage them in any way. But empathy for the victims is an ask on top of policy, and "maybe there will be some bad indirect effects" is a weak argument for it.
Young MAGA-adjacent dumbass who can't get laid sees pretty girl spouting MAGA stuff, reads all her posts and follows her or whatever, The Algorithm(TM) feeds him more MAGA stuff and MAGA posters, his whole social and information environment becomes that much more MAGA. Works even if he knows from the beginning that she's AI, but just likes the eye candy.
> or that there's meaningful room for further embittering them.
Young dumbass who can't get laid sends money, doesn't get the engagement he wants and/or realizes she's AI, can't accept feeling stupid, further projects his problems onto everything and everybody outside of himself, seeks out material that enourages him to do that...