I don't think this is true. There was the whole fiasco around the EULA canary that a company had that, if it was removed, was supposed to indicate that the comp

I don't think this is true. There was the whole fiasco around the EULA canary that a company had that, if it was removed, was supposed to indicate that the company had received a gag order. I don't believe it had been actually tested in court. I believe it had to do with the FISA court system. I can't find a link but there are definitely cases of gray area where courts have required entities to lie. https://en.m.wikipedia.org/wiki/Warrant_canary https://en.m.wikipedia.org/wiki/Warrant_canary