Is he aware of subscribestar? Can he get an account there? They tend to not care about this stuff.
Viewing post in Monster Girl Island: Prologue comments
Payment methods from that site does not support all types of payment, so they didnt want to take the chance with them. Plus alot of the people supporting them didnt just use normal payment methods, so they would lose alot of members for it. So instead of trying to switch to a new one, they decided to just leave Patreon and stop getting funded for the game developments. Now they will try do it when they got the time. And for free.