Fedora says nobody from Cuba can use it but they can unless they’re enforcing IP block for Cuban IP

Where I completely disagree with disallowing people in Cuba from using a distro... I'd wager at least some of it has to do with redhat being a business that makes money and that is at odds with the horseshit blockade and sanctions. And by that logic I wouldn't be surprised to see something similar from canonical, especially support related as that's something you can purchase if I'm remembering correctly.

That's my thoughts without knowing the specifics so I'm quite literally talking out of my ass and spitballing.