Would you say same thing for using encrypted communication app like Telegram, PGP?

Perhaps not. Private communication is more central to our national values than customized money. That's why only one of those two things is protected by the constitution. That being said, I don't think they'd really get far with such a rule, since any prosecution based on it would be easily challenged on constitutional grounds. So we will probably never find out what in fact I would say about it.