Try adding an advertisment page where users of your site go to and charge their account with donation tokens, then they can (or forced?) to donate those tokens to modders, later you redeem the tokens (Donation Points) from modders with money. This way (or around it) might work.
1- Users makes money from advertisment page or referral links/codes/CryptoMiners.
2- Users pay modders who the users support with Donation Points gained from point 1.
Note: I never used advertisments, so I can't tell how profitable this will be.
My 2 cents.
