For everyone saying OP should let their kid play Roblox and just ban spending money… just no.
Roblox exploits child labor for profit and they have terrible scummy business practices. If you have even marginal ethical qualms about child labor and/or capitalistic exploitation of vulnerable people, you should be keeping yourself and your family away from Roblox. In your mind they should be in the same category as multilevel marketing, crypto scams and door-to-door religion peddlers.