That's the fascinating part to me. Installing thirdparty apps on iOS? Criminal, security circumventing, stability affecting. Installing thirdparty apps on macOS? Click the confirm button if you're confident, I guess
On Android you have to explicitly allow installs from unknown sources and it warns you that it could make it possible to install malware. This has always been enough of a deterrent on Android and I don't understand why the same can't be true for iOS.