> I'm not massively clear on where loot boxes and blind-pack card games/sticker collectables differ. Both are fixed price products where you don't know the contents, with the value of said contents varying massively from the invested cost, along with the ability to trade/sell the contents on secondary markets.

I'm also not clear how this differs from an MMO where you kill monsters over and over hoping for piece of random loot that can then be virtually sold.