Are you completely unfamiliar with the concept of software piracy?
I knew the Patron system is a Donut system, but the Patron subscribing part confused me a bit, which was solved. Regarding your question, I think the reason why developers switch to Donut is that every game can be hacked very easily.
They hack million dollar games, so hacking porn games is not a difficult task
Therefore, they prefer to switch to the donut system, which is a more beautiful system in my opinion
Because in both cases, if the party designs a good game, it earns good money, but when it is from the donut system, a beautiful feeling occurs.