Comment by adnzzzzZ

Plenty of roguelikes or roguelites have locked chests that can only be opened after you play for an arbitrarily long amount of time. That is the same as a lootbox in a game that lets you buy lootboxes with in-game currency at a slower rate than if you paid for them, such as the example I gave with Genshin Impact, where you can open lootboxes while paying nothing but the game is also structured to incentivize you to pay.