Because you haven't heard of the proprietary software that wasn't ever sold internationally because of these bans.

Of course Joe Sixpack can throw their code up anywhere, but Joe Corporation gets wrecked if they try to sell it.

https://developer.apple.com/documentation/security/complying...

For example, this is enforced by Apple Store.

But that's not the goal, the goal is to protect the "intelectual property" only to American companies. Countries not in the "friends list" cannot sell products in that area without suffering repercussions. That's how the US has maintained technological dominance in some areas by restricting what other countries can do.

If i remember correctly, if you changed the dropdown on the webpage to USA you could download the full version of PGP anyway.