I'm considering banning Roblox for similar reasons. I would let my kid use some pocket money to buy Robux, but then I found out his friends would log into his account and spend any spare Robux he had lying around.

I've tried to get in to it myself to better understand it as a mechanism, and I'm at a loss as how it's so popular.

My guess is that on the surface it looks innocent enough to naive parents but in reality it's quite a bit 'elsagate' in nature.

I am happy that, right now, he prefers to spend time in Minecraft with his headset, it's a much more positive game (making houses and exploring without predatory in app purchases).