You can't even do that. The ml here isn't actively spoiling mc with money. He buys him clothes every now and then but that's about it. He keeps raping him, keeps him locked up, doesn't erase his debts, doesn't help out his grandma stuck in a subpar hospital. The only minimum he makes sure of is whether the mc is clothed and fed. That's it. So I don't think you can dry up his money in that kinda situation
Oh come on haven't U seen magnificent century it's a real life story the girl whole family and lover killed by her husband and she dries him up, ofc not by resisting u just adjusting even if U don't like it (︶︿︶)=凸 actually the obsession isn't bad situation the worse was him falling in hands of someone that throw him away u know like pros... Ehm

I'm serious. What would you guys do if you end up psycho like this? Like I cant see anything other than dying.