Buying a blind box, loot crate, card pack, etc. with a random chance for items is something that we as people have a high chance of finding addictive, like some kind of misplaced survival instinct. Genshin monetizes their game that way, and you may be lucky like me and not have whatever gene causes us to become crippling gambling addicts, but Mihoyo became a multibillion dollar company off of exploiting those people the same way you might find someone at a corner store playing scratch-off lottery tickets all day, or someone seated at a slot machine with a jar of quarters, mindlessly pulling the lever over and over again.

That's quite different than if you say, "I'm selling item X. It costs Y." Digital items that are arbitrarily only available for a limited time, more often than not through battle passes these days, are like gacha, similarly manipulative. I wouldn't call MMORPGs some bastion of morality, either. I'm sure you saw the same stories I did back in WoW's heyday of parents neglecting their children because they were helplessly addicted to WoW. Whether by accident or design, WoW took the addictiveness in Diablo's design and, thanks to a lucrative monthly subscription fee, created an incentive for their developers to pursue avenues to keep players playing longer.