Depends what "ban" means. If it refers to them not being able to be commercially active in the EU because they violate EU regulations, sure. So no selling ads, no targeting ads, no selling blue check-marks.
If it refers to preventing people from the EU to access their website through meddling with DNS or similar means, then i am against it. We should be able to access it, but they shouldnt be able to make money off it in the EU.