Which is what loot boxes are - close enough to gambling that regulation is needed. Don't give me the "you always win something" argument either - as said already, 99% of items in loot boxes are trash deliberately put there so that you will likely get those instead of the thing you actually want. You got something, but you lost.
"The house always wins" is a turn of phrase - obviously people can win money. The point is that it's essentially impossible for a casino to not make money because the odds are immensely stacked in its favor. Same goes for loot boxes, but even worse because for most of those systems money can only enter and not exit. You have pixels worth nothing to anyone and usually trapped in an ecosystem unlike physical trading cards etc.