UpdateThe scam page:
https://bitcoinmixer.orgis now finally closed down.
That is both good and bad.
I expect they will re-launch under new logo/brand/webpage.
I learned my lession, please dont make the same mistake as me, follow the advice from LoyceV.
I checked the site, and it doesn't offer a Letter of Guarantee. That should be reason enough not to use them. I know only one mixer that has a good reason not to give a LoG (because they give you private keys), any other mixer should provide one.
Unlike a signed message, screenshots can never be conclusive evidence.
I've seen this scam before, and because of the lack of LoG, they can create a smoke screen about phishing. If they'd be honest, they could have prevented any fake scam accusations by providing for a LoG. But they didn't.
They copied the 4 step design from ChipMixer.
Quoting myself:
Others have mentioned it already, but you really need a Letter of Guarantee signed from a Bitcoin address mentioned on your site and archived here on Bitcointalk. That's the only thing someone could use to prove foul play without any doubt.
I'm pretty sure selective scamming was the plan from the start. I'm considering a neutral warning on any new mixer without LoG from now on.
Have a good day out there, and remember to HODL.