
Sure, if it's through Paypal, but in that case an individual GM could simply set up a paypal account and do it himself including all the tax reporting. I'm thinking from Roll20's perspective it makes little sense to expose themselves to the potential legal hassles of becoming a mini paypal in order to facilitate a tip jar. Also Paypal isn't great for super tiny transactions (around a buck) because they have a minimum $0.30 fee. Source: Someone once gave me $0.31 through Paypal. :P BTW there is a GM on reddit /rpg that charges for his time, so it's not unheard of. Pretty sure he does it at brick and mortars though.