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That's pretty ingenious. I've always thought the best way to communicate something like insider trading info would be on a stock board. Or if Trump wanted to communicate with Russians, it woudl be much less traceable than email. Email is one to one, a message board is many to many, hard to track down, and most messages are incomprehensible gibberish anyway, like this instagram message.
There's a newsgroup, alt.anonymous.messages, which was created for this purpose. However, using it makes clear that one is intentionally sending a secret message (and in some environments, maybe reading would also show that one expects to receive one).
Note: The regex in this article is wrong. What the article currently lists:

  (?:\\u200d(?:#|@)(\\w)
But this is an invalid regex (parens aren't balanced), and it wouldn't work anyway. I believe the correct regex is

  (?:\\u200d|#|@)(\\w)