Um, sorry - Geo restrictions are a *much* bigger deal, since they effect pretty much everyone who buys e-books. Yes, even Americans. Try buying a book only available in the UK, which I did with ease before the restrictions.
I'm sorry you're having trouble, but complaining because of Linux 'discrimination' is a little, well, whiny. Lots of software won't work with it - it's a niche product, but you knew that when you installed it, right?
I'm sure some other Linux users here will help you if you ask.