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they are already doing it.

The issue is not your feed, that's what Facebook wants you to believe, you agreed to share that data with other FB users. the issue is they transfer personal data of EU citizens to the US to process them and sell them or use them to improve their adv war machine. Or give it to their US government.

Probably not too difficult for a company like Facebook, don't you think?

Much harder for a large company than a small one, actually. The coordination overhead to get a bunch of disparate teams in a large company to rearchitect the fundamental structure of the service should not be overlooked.

Personally I'd be happy to accept that given Facebook's impact on society and their technical ability and capacity.

Not difficult at all, I did that on a much smaller case.