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It was at the money2020 conference and I work in the bitcoin industry so I was naturally curious.

I guess it adds another layer on anonymity to it. Online exchanges often require your name and address, and even if they don't, you're probably going to be funding it via a debit card or bank account which can be traced back to you. By using cash, there's no way of identifying who purchased the bitcoins (except via cctv I guess)

Whatever the location, you can imagine the CCTV that will be around them when they appear in the wild.