Walled gardens are good because if you insist on picking your fruits only from the wilderness due to moral principles you're gonna get mauled by a bear some time. Sure, you might prioritize feeling morally superior, but the majority of society is more practical

This is an absurd false dichotomy. You can pick fruits from the wilderness and not get mauled by bears. Using apps not in walled gardens has nothing to do with attempts to feel morally superior.

You teach people to stay the hell away from bears, and everyone is better for it.

Isn't the better analogy that you insist on being able to get fruits from anywhere - including neighboring towns or the wild - and not just the local marketplace?

Yeah I could get mauled by a bear if I get my fruits from the wild. But that's probably not a risk with the vendor from a neighboring town.

And if there's a fruit I can only get from the wild, who are you to tell me I can't have it? Maybe I get mauled by a bear. Maybe I get robbed in the neighboring town. But what else am I to do when what I want isn't available at the local marketplace?