this is all fucking funny considering its coming from FAKKU, how much fucking stolen hentai is on there website that was translated from people not related to fakku? did they ask the original authors if they could upload their fucking doujins on there and make money by ad revenue on every page? you bet there fucking ass they didnt.
Ive only kinda studied copyrignt law in the past on my own time, but runy i would ask them for some form of proof that they have the right to demand money from you, perhaps a copy of their contract from illusion. then go online and find a local lawyer and pay the man to look it over. it could very well be that they only have the rights to distribute the game in america but they were not given any copyright powers. meaning they could stop you from providing the whole game for free, but they cant do shit for you providing a completely separate game using its assets (in another engine no less).
money says they are on very weak ground here and wouldnt stand a chance in actual court.
EDIT: and by fucking gods sake stop showing what you make monthly on patreon, hide that shit till this is over then re enable it later. that fakku asshole is probably going WOH HE IS MAKING 15K A MONTH AND WE DONT MAKE SHIT, LETS MAKE HIM PAY A LICENCING FEE (that they dont actually have power to charge for)