Unless something has changed very recently, you can't sideload apps to your iOS device without getting a developer account from Apple and owning another apple OSX product from which to do the installation.
Not to mention being unable to use non-safari browsers on iOS and the scanning your images for illegal stuff they're planning on rolling out, and the extremely egregious anti right-to-repair lobbying they're doing.
Apple is not your friend. The less control we have over their device, the more money they can make from us.