Mega cool!
We should all be taking full advantage of the amazing capabilities of the pocket supercomputers we all carry around with us at all times (even if the companies who make them don't want us to or don't care about us). Anything less would be silly! Now Linux and Windows users (the majority of iPhone users) can do easily do so, and that's great.
To install your own personal homebrew apps without Apple's approval, use AltStore (Windows) or SideStore (Linux):
https://faq.altstore.io/altstore-classic/how-to-install-alts...