If such a law existed in the US, it wouldn't matter that you violated it, since it would be found invalid under the First Amendment. Does the EU not have any equivalent to protect freedom of speech from unjust laws?
The equivalent is in the EU Charter of Fundamental Rights (Title II - Freedoms, Article 11). But I'm not sure why you think freedom of expression permits a business to publish things in a mis-leading manner?
That says "The exercise of these freedoms [...] may be subject to such formalities, conditions, restrictions or penalties as are prescribed by law", which seems to basically be saying that laws can override freedom of speech in the EU.
Yes, of course. That's why when I buy some food I know that the list of ingredients is the actual list of ingredients and not someone's free expression. That helps me feel safer as a consumer. Same in this Twitter case. Does it really work differently in the US?