[lio45]

By definition, using a loophole is always technically legal.

Normally, if a loophole gets identified, you introduce legislation to close it, and THEN no one will be able anymore to do what was doable using it... but you can't retroactively invalidate something that was legitimately done using the loophole back when the laws allowed it (even if it went against the "spirit", it complied with the "letter").

At first sight, the developers are on the right side of the law here.