What the tailor does is not unique. There are a lot of tools in the high-price area which can do the same thing. They are not illegal, neither is the Tailor. If DAZ wanted to banish the tailor, they could have talked to codetwister to changed the licence in a way that does not allow to share tailored items. I do not think they tried to, since the tailor is a two-bladed sword - it can help to sell more products and can help to make products obsolete.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.