Hobbyists develop and put out custom ROMs for phones and they have little to no financial backing or even expected future profits. I'm sure it will be profitable for US companies to modify their (base) products to comply with the EU market.

That "certain point" is so far away, it might as well not exist.

If the market will be left to EU companies, they will develop pretty big competitive advantages because of their focus on interoperability, localization and privacy, which may help them eventually to re-colonize America. The business just became more difficult, but the sharks are going to survive and eat the loosers.

>they will develop pretty big competitive advantages because of their focus on interoperability, localization and privacy,

I watched Apple grow into a 1T dollar company doing the opposite of everything you said, while marketing everything you mentioned.

So... it might work.

Keep dreaming

It could, but we are a long way off from that. Apple pulls in close to $100B per year in Europe. It would be corporate suicide to give up the region.