And also because my kids can spend tens of dollars in minutes on it.
Audience is the problem here. It's obviously not a big deal if the platform is targeted for adults, but majority of users are underage. The platform can certainly implement guardrails for the vulnerable users if they wish to
Every Christmas and birthday now is "I want Robux" and they are actively annoyed if they get anything else
This thing is bad for children
The fun single player games only need to convince you they are a fun experience and you should buy them once.
Games with loot boxes are trying to convince you every day to spend money on them. Dunno about roblox, but often the items are visible, and "defaults" are often perceived as poor or noobs.
We can't be naive: It's a whole other level and companies are spending millions on manipulating kids to spending more and more money.