Secondly I had that...
Games where you can buy individual loot boxes without any spending limit in place, as well as games where items can be sold for real world money cross into unethical territory. Games can also be unethical if they are highly addicting, even if they do not have those monetary factors.
From this observation I read a research paper about these gambling mechanics, how they operate and tried to decipher what was fun about it, you know what is good game design, and what is unethical and preditory
For my game I want to find the balance between randomness and fun, and unethical gambling