I have a mixed opinion with the swap option XMR and ETH but surely because I'm too maximalist.
Of course there are people who will be interested, but I don't know if the demand is high enough to be viable.
Maxi here also, and eth hater by default.
But I can understand WW tactics, they are a business and they have to offer something more to their clients, and to be able to break completely the chain while doing a hoop on some other altcoin might sound appealing to enough users to be worth it.
Besides, they will find out themselves, if it's not working and not gaining traction at all they will simply drop and we will have BTC only again!
This would be an amazing thing to have, many users would want to use the mixer as an exchange instead, a no-KYC exchange is certainly needed by many users, not sure about the legal implications since the service will no longer be just a BTC mixer, but rather an exchange and a mixer.
Wouldn't this be categorized as centralized exchange?
Echoing these concerns, at this point you're going to be more like a no-KYC CEX than a mixer, but I assume you thought of this at least one step further before you started working on it.