Kids have been at it for way longer than that. What are packs of trading cards, if not loot boxes in the physical world? I knew plenty of kids who spent all their allowance money on packs of Pokémon cards, hoping to score that rare Charizard.
And removed all of the friction. They’re available 24 hours a day in unlimited quantities. You don’t have to wait until after school. You don’t have to wait for the local toy store to open. You don’t have to wait for the store to have them in stock. The next box is always just one push of a button away.