"Research produced by the University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin"
The same University of Cambridge states that the number of unique active bitcoin
wallets as of beginning of 2017 fluctuated between 5.8 million and 11.5 million (if compared, in 2013 that figure was in between 0.6 and и 2.6 million).
Does is mean that at a unique BTC user has got al least 2 active wallets?
Or it means that users are increased and so it's a good news because if the bitcoin use grow, the price will do the same!