@martismartis. It is not really the same. Why would I have to go thru NXT and multigateway when there are already reputable tumblers out there? Also the volume and amount of coins the tumbling service will really matter so that the mixing of the coins will become more effective. I believe the coin shuffling service is not really used by the bitcoin users so there is reason to believe that the volume there is low.
I believe you are replying under the mistaken assumption that this is aimed at Bitcoin users.
It's a feature of Nxt and this *can* be used by people who also use Bitcoin.
However, it's primary function is for Nxt.
Your assumption would be analogous to saying that the new lock on my car is cool, but useless because it doesn't fit on *your* car without modification.
That comment would be of course true, but would also not make sense.
Nxt CoinShuffling is a working version of the protocol and the first implementation of the decentralised CoinShuffling protocol. Whether or not it is useful for Bitcoin is a moot point.
The opinion that it *should* be useful for Bitcoin is not something to lay at the feet of the Nxt developers. It makes no sense for them to develop a tool in their own platform with the express reason of servicing another platform. While that may bring volume, it can not be the prime reason for any implementation. Nxt and Ardor build for Nxt and Ardor, not for Bitcoin.