You don't see what you said there, do you? You just supported what you're arguing against. Let me break it down for you...
Loot boxes in games like Fortnite, etc., have been found to be addictive
because they work the same as gambling. It reached the point where various countries (and states in the US, because Congress is full of people sucking at the corporate lobbyists' teats) have
instituted laws and regulations around loot boxes. That's because of how addictive they are. As a gamer (currently working through Forza Horizon 6 and Metroid Prime 4), I don't think a game isn't fun if it isn't addictive, but as a high school teacher and parent, I've seen how addiction works with games like Fortnite. It's very, very obvious.
So...how is doomscrolling (when we know from internal Meta documents that they are creating the apps to prey on peoples' addictive tendencies) any different here? There's no flaw in the reasoning.