May be.
Still doesn't mean we can't do it for our group.
In addition it could be made legal by releasing it via S&P (a thing we always kept in mind) - if Mongoose at all plans to keep the SST license and not kill the game entirely. And if they still care for (and are willing to benefit from) people spending time for improving their game systems.
If not, well, then it's just for our own fun.
Still doesn't mean we can't do it for our group.
In addition it could be made legal by releasing it via S&P (a thing we always kept in mind) - if Mongoose at all plans to keep the SST license and not kill the game entirely. And if they still care for (and are willing to benefit from) people spending time for improving their game systems.
If not, well, then it's just for our own fun.