I was unaware that such thing happened, and I'm kind of surprised as it sounds like somewhat un-EU-ish to me, but I obviously had the wrong sense of what is EU-ish. And I wholeheartedly support that. I mean, it makes sense. If the domain policy of *.eu says that it is for *.eu-based people and organizations, and you leave the EU, why the fuck should you keep it?
If EU wanted to make more money on it, it would have made it available for everyone from the start. If it doesn't... well, it just means domain-selling is not the core EU-business. So it's exactly one of the 2: either Russian and Japanese companies should be allowed to own *.eu domain, or British ones shouldn't. And I don't honestly care which one is it. But it cannot be both at the same time.
So, no, it's not about hurting you, it's simply about the fact that the world doesn't revolve around you. As surprising as it may sound.