The limitations depend on which program you’re using - there’s more than one - which is why I only gave a simple example.

No it doesn’t. It’s in all the documentation, official and otherwise

Side loading is installing an app from anywhere but the official store. So by definition “third party” is side loading. Whether it’s another store or authorised is irrelevant.

You can’t just make up a definition, believe it, and then share it like it’s true. We’re going by the legal definition as that’s the only one that matters.

Apple only allows up to 3 apps or 10 appIDs to be sideloaded, wherever you are in the world. Period.

Wholly incorrect. You’re allowed to sideload up to 3 apps (or 10 appIDs, whichever comes first) without being a developer, and that arbitrary restriction is removed if you pay for a dev license, regardless of which part of the world you’re in.

In the EU you’re allowed to install third party app stores (still have to be notarized by Apple) which isn’t sideloading

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Apple allows sideloading (somewhat), this is would be demonstrably worse (if enacted)

Even pre-brexit. The UK was never part of the EU, culturally speaking