Base on the updated date of the domain, 100bit update there domain first before preev.net which means they might be the first to use it. But you have a point that this kind of format is available in public marketplace which means who is first doesn’t anymore if this software is for sale publicly.
This is a free script, it can be used by anyone who wants to.
otherwise, there are several shortcomings that could be improved, so this is only a temporary solution on preev.net
you can participate in a discussion about that improvement here
https://bitcointalk.org/index.php?topic=5411037.0It looks like a number of members came up with an idea of creating a preev.com alternative after the previous incidents where it kept going offline
the whole thing about it is very interesting and it is obvious that there is considerable interest in such a service.