It would be without the need for email registration, of course, or any sort of registration for that matter (except for those wishing to commision work).
How your platform plans to protect the anonymity of those that fall under the category that I highlighted in red
[e.g. Government comes knocking at your door]?
In addition, payment for work via cryptocurrency would ensure anonymity,
To an extent, "YES" but not completely.
Has there been any interest in using a similar service?
Not that I'm aware of.