I could be wrong, but from what I see it was first registered in the end of 2024
See
archive.org for it's history.
Strange how this was not reported in whois website, but that old website from few years ago doesn't look anything like eXch we have today.
If I remember correctly, the first official eXch username on Bitcointalk was exch.cc, just because of the domain. They changed that about a year ago.
Here is the confirmation Yeah I remember there was some changes with forum usernames and domains.
Having a clear list of all phishing domains and all valid domains would be a good idea.