Since it's the exchange support, autocorrect component and android support that come with the paid Sailfish X, my hypothesis was that one or more of these were subject to being licensed for distribution by the IP owner in certain areas only, the UK perhaps no longer in the EU and thus not in a covered area. I've got no special knowledge, but I doubt that Jolla wants to impose restrictions keeping Sailfish X (technically) out of such places as the US and UK, and I doubt that the EU is concerned about distribution due to weaponization(?!) of spellcheck or something like that. The answer is probably just boring and annoying.

But like I said, I do want Jolla to get paid, so once again "music" wins the day.