You need to be tethered to enable the JIT, without it UTM is very slow. Even TinyCoreLinux was extremely slow.
Whether Apple is in compliance or not is up for debate.
Obviously AltStore did the best they could..
> APPL's attitude
Everybody knew from the beginning that they’ll do the minimum they can get away with so blaming Apple is somewhat pointless.
> ... Everybody knew that Apple would be uncongenial, borderline malicious ...
> Therefore its pointless to blame Apple
The entire fault is on Apple. The EU that is notoriously depicted as overly bureaucratic and slow-moving managed to make the largest consumer walled garden to relax its gates and give some form of authority to people who own the damn device.
Remember, no form of official sideloading existed before the DMA.
MDM has long existed. In fact that was Apple's counterpoint to alternative alt-stores.
Certainly it didn't allow you to bypass any execution restrictions any further than the regular app store.
Random link: https://it-training.apple.com/tutorials/support/sup530/