To my knowledge, that is because of the psychotic Leftist judge they have who keeps arresting the Brazilian twitter employees, so there's no way to keep the company functional in that country. The EU would have to start doing that to reach an equivalent threat level, and I don't think they have the political footing to do that yet.

I suspect it would cause a rash of requests for political asylum in America (or other EU-neighbor nations) that would be extremely difficult and costly to ignore.