[mutt2016]

I read about a child porn guy on the dark web once, he was an auzzie I think. He always said some strange greeting on every post. He would say hiyas.

They found Facebook posts where some dude said hiyas, did some police work and got him.

Found an article: https://www.bbc.com/news/uk-36437856

This isn't quite the same, but validates the point you are making for sure.