I'm curious, how difficult would it be to implement a feature that allows viewing a match in the lobby? So that you could join a room from outside and observe the game? I think that if you implement something like that and set a donation goal for introducing this feature in the lobby, you could raise any amount of money quite quickly. You could also make entering the game as a spectator paid (10-20 rubles per match - it would add up to a decent amount if collected from all spectators).