Just because two things are "annoying", doesn't mean they have the same ethical problems.

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.