Gacha is definitely gambling even if profit isn't the primary motive. You could argue that profit isn't even the primary motivation of many poker players, but rather being seen as smarter than the next guy or more able to call bullshit.
Loot boxes on Netflix would be, you have no movies when you start:
You pay 2$ to add Random 3 movies to your library. Wanna watch Breaking Bad? Pay 2$ until you get “lucky” (and maybe get only Season 3).
Ah, and maybe because it’s premium show, there is only 0.5% chance of getting it in every “loot box”.
So you might spend thousands of dollars, and not get what you want… Because usually there is not even a way to spend 10$ to buy it like a movie on Aplle/Amazon, you have to gamble!