I'm aware of the purpose of advertising, that doesn't make it not manipulation. Additionally, advertising to purchase more of the product you're already using while you're using said product is scummier than advertising a one and done transaction, or a continuous transaction that isn't further advertised in-game.

I'm against the profit motive, but obviously I understand that there are degrees and shades. That's why I said I'm more okay with products that don't manipulate you while you're using them, like one and done transactions or subscriptions.

You still see advertisement in LoL because nearly every player uses skins that aren't the base, whether they paid for them or not. It gives out free loot crates that further incentivize gambling by giving you a taste of something addictive.

The profit motive leads to bad things, yes, but the way you go about them is different. See: Celeste, or Hollow Knight, or Signalis, or even AAA games like Prey, or multi-player games like CS:Source, all games that advertise and then cease to advertise once you're actually in-game or have purchased them.