Crypto mixers, OK, that's what they're called. Yea for people who basically want to launder money. Interesting stat on the low incidence of illegal activity - of course the article said much of that isn't tracked so we really don't know. But regardless, there is no doubt there is both legal and illegal activity, but I would love to see a pie chart of what kinds of transactions are happening, e.g.

- Purchases of goods and services domestic

------First world countries

------ Third world countries where govt isn't trusted

- Purchases of goods and services international

- Purchases of good and services illegal

- Transfer between people

- Money laundering suspicious behavior

- Overlaid with conversion to/from fiat and other currency.

Of course these numbers are hard to come by, but would tell the story of what's really happening.