The Altstore they are referring to is the sideload version, not the EU store that was just released. This requires a computer to install the IPA file. Once you install UTM using this sideloading method the only way to activate JIT to make UTM useable in any meaningful way is to be on the same local network as a computer with SideJitServer installed and running. Then you can use an emulated OS and drain your battery super fast.
Long story short UTM is not currently a solution. Apple either needs to allow JIT for all apps or SideJitServer needs to do the impossible and figure out a way to activate over a remote connection.
Long story short UTM is not currently a solution. Apple either needs to allow JIT for all apps or SideJitServer needs to do the impossible and figure out a way to activate over a remote connection.