You probably will need to take advantage of network effect in some way. I.e. if I have a $10/year paid account and I create a group, the person joining my group

You probably will need to take advantage of network effect in some way. I.e. if I have a $10/year paid account and I create a group, the person joining my group can join it for free, however if they are trying to join another group on their own then it would get them to pay. Or free for X period of time, because getting a person on the platform to start is hard. I registered but I don't know anyone that has it so I have to convince people to set it up. Maybe allow public groups? Or maybe not. Looks rather cool!