"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."
Note the subject.
So yes, the First Amendment is okay with any censoring of information by a foreign government or company.
Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers."
I don't see any mention of government there. Why limit the interpretation of free speech to the US constitution? How do you reconcile ideologically or philosophically that it is not ok for US Congress to limit speech but ok for other powerful entities?
Note the subject.
So yes, the First Amendment is okay with any censoring of information by a foreign government or company.