You’re missing the distinction between easy and profitable.
Going back to the top of the thread, the idea was that this is a decision that looks bad in a moment where everyone’s looking at Facebook.
If extending the behaviour worldwide were a difficult engineering feat, that’d provide a simple outward justification for Facebook to not bother.
But in reality, It’s more difficult to keep the two systems around.
Taking that path implies that Facebook actively benefits from breaking the EU law, and justifying it outwardly in the current climate means establishing how the EU law actively harms Facebook’s users... while not admitting that they violate user’s privacy, and profit from doing so.
[And as others have suggested... even if it’s the right move to implement things this way — it makes ~0 sense to draw attention to it.]