Google’s Android, the world’s most widely used mobile operating system, started life as open-source software. In its quest for ever-greater profits, the tech giant has been gradually eroding Android’s open-source nature over the last decade.
Originally published on The Lever, but that one asks you to sign up.
Sadly iOS is not much better
You can’t sideload on iOS at all.
You can, but it is a pita. Having to buy dev certs and sign the .ipa file, etc. But technically, if you really want to, you can.
In eu you kinda can for some degree