That's a sneaky one! Try to report it to their registrar
Here is another "unofficial" domain
I found another one that was recently registered
exch[.]ac currently hosts a website that is a phishing copy targeting our original service (eXch).
I see the list of websites impersonatig eXch and this worries me and also brings me some bad memories... In the era before mixers were banned there were plenty websites impersonating a particular mixer.
If I remember well, paid2 did many efforts in that period and managed to take down a bunch of those copycats.
Perhaps he could share his expertise here...? Or give a hand of help once more...?