This is not about that, it was not even AMD's choice, it is actually the EU that blocks random companies from selling whatever they want here without conforming to their standards. ASrock does not make the cards themselves. The Chinese company that makes it for them (and also for Colorful brand), does not have the rights to sell cards in the EU. EU has strict compliance laws for tech products that would require them some investment to conform to. See CE Marking.
Different brands like Sapphire and Zotac who also not make the cards themselves but buy from a different Chinese company - one that confirms to EU regulations therefore allowed to sell here.