With regard to the idea that Apple should stop selling iOS devices in the EU: https://daringfireball.net/2024/03/eu_share_of_apples_revenu...
But pushing Apple to make iOS available on other phone hardware is a massive undertaking. iOS is developed for a very constrained hardware set. When you move away from that and the optimizations thereof, what's left? It's a major distraction, you'll either get a much worse experience on other hardware, or the general polish and performance of iOS takes a nose dive. I don't see why Apple would spend the money to support this the way it would need to be supported rather than leave.
Wait where are you getting this from?
> While the announcement is a step shy of being a formal investigation, the EU aims to compel Apple to re-engineer its services to allow rival companies to access the iPhone’s operating system. One of the aims of the DMA is to ensure that other developers can gain access to key iPhone features, such as its Siri voice commands and its payments chip.
It sounds more like pushing Apple to open some APIs and allow for some more integrations, which seems much more reasonable than your interpretation.