I love how you say ‘almost every app’ and then your three examples include two Meta apps and also Twitter. Their whole business models are to gather as much as possible to sell.
Not every app needs your health data, financial information, and usage data to send short messages to their friends. I get wanting a certain amount of data in order to do certain things but needing basically everything possible frankly SHOULD BE eye opening to people if they didn’t already know.
It’s because a lot of people migrating from Reddit landed on .world and created or found their familiar named communities and that’s how it was on Reddit - US centric top level type communities.
Is .world the best place for US centric communities? Maybe not just based on nomenclature but since you asked why, that’s the reasoning. It’s in the description of Politics specifically (it even calls out migrating Redditors).