This is also one of the reasons the government is fond of gag orders. If companies could tell you "sorry we closed your account because of government pressure" then at least you would know why, but then you would know why. Which could give you standing to challenge it or create bad PR for the government and generate public outrage sufficient to make them stop doing that.

So instead they censor the company from telling you the reason, because everyone whose account is locked is guilty of Terrorism, obviously, and the people actually committing fraud would be unable to discern that they've tripped the detection system from the fact that their account is locked unless you told them that was why. Certainly not because it would make people unsympathetic to what the government is doing.