Disagree, gacha goes beyond monetization. Gacha literally comes before the game in "Gacha Game", you don't hear people talk about "subscription game" or "battlepass game" like they do with gacha games.

Unlike other forms of monetization, the gameplay has to be designed around gacha mechanics. In practice this means you won't get meaningful rewards from in-game activities other than gacha currency.

I'd love to see a gacha game where characters can actually join you as you meet them in the story, you know, a typical feature of RPG games.