Unfortunately I was proven to be right about Riley Testut. He's yet another greedy person barely batter than Apple. After removed to Apple to remove GBA4iOS from the App Store he's now leveraging Delta to force people into his AltStore.
Delta has finally made its way to the App Store. Additionally, the Delta developer has also published their alternative marketplace, AltStore, in the EU today.
If you're in the EU you'll only be able to get Delta on the AltStore and that requires:
This is complete bullshit he could've just launched Delta on the App Store in Europe as well but he decided not to.
Thanks Riley Testut for being a dick to the people that actually forced Apple into allowing alternative app stores in the first place.
Github issue related to this dick move: https://github.com/rileytestut/Delta/issues/292