Xcode is able to dynamically generate a development provisioning profile, even if you do not have a (paid) developer account. So side-loading is definitely possible, in some respects.

You need to create a developer account, learn how to use xCode (not at all trivial), and even with all that you need to reinstall it every 7 days.

Effectively sideloading does not exist. The fact that 0.001 percent of people who own an iPhone can, with great effort, sideload apps is irrelevant.

You don't need a developer account anymore to sideload apps on iOS.

But you still must reinstall every 7 days?

Yes, that is still a thing.

Unable to reply to Illniyar’s comment below. To add to those points on the difficulty (actually practical impossibility), you’d also need to have access to a Mac to do all those things every seven days. That’s a very big ask, along with the technical know how to use Xcode, for so many people in Hong Kong.

Does anyone know the reason(s) why Apple makes it impractical to sideload?

Side loading is a threat to Apples control over all iOS and similar AppStore devices. If I didn’t want to comply with the very far-reaching requirements for e g in-app stores, I could just ask my users to side load my app. If for example Audible did this, it’d be a real threat.

Chief among this is the requirement that all in-app purchases have a 30% tax by apple.

Which is why you can't buy books in the kindle ios app[0] among others.

[0]https://www.techspot.com/article/1597-how-to-buy-kindle-book...

Still waiting on regulators to slap Apple for that obvious anticompetitive behavior.

I'm not 100% sure because I didn't use it, but cydia impactor might work.