How exactly is that lesser than Apple not even allowing app vendors to install their actual browsers, instead forcing them to use a subset of an API that Apple

How exactly is that lesser than Apple not even allowing app vendors to install their actual browsers, instead forcing them to use a subset of an API that Apple itself fully uses? Or what Apple has done repeatedly to Spotify and others? Apple forces Spotify to add a premium to their app price or take a hit in price compared to Apple's direct offering, while explicitly disallowing Spotify to even communicate to customers that a Spotify subscription, which has zero relationship to Apple, can be bought elsewhere? This allows Apple to gobble up millions and probably billions of app store purchases that do not require the app store aside from Apple's bullying of "abide or get off the platform" approach. Beyond their walled garden that prevents even the opportunity of bullying in many cases, Apple is absolutely one of if not the biggest bully in the entire tech industry.