Can they actually prevent it though? In typical cases there would be IP licenses involved. But in this case it's a valuation based (AFAICT) on a team of people plus their infra. What happens if they all just happened to get hired by "AnthropicEU GmbH" a new entity which has been gifted hundreds of millions in computing resources?

Having one „champion“ is flawed European approach. We need local competition and headhunting to make it fly.