“A functional and interesting reward cycle that sort of combines PbtA-style GM moves (called GM Intrusions) and peer rewards/fan mail: when the GM wants to inject a complication (no GM rolling!), the target player gets an XP and then can also give an XP to another player. Or they can reject the Intrusion and lose an XP. No idea what the flow is but this doesn’t sound grossly punitive.”

It works very well in play. I usually accept intrusions because saying no is boring. It’s a really fun system to play.