Serious concern and asshole move? Yes. Gpl violation? Not sure. You could argue you are not restricted to do whatever you want with the code you receive with a subscription. But if you share the code, they don’t want you as a customer anymore and won’t give you new code. I don’t know if the GPL allows that.
Now THIS is a GPL-violation or at least a serious concern and asshole move.
Serious concern and asshole move? Yes. Gpl violation? Not sure. You could argue you are not restricted to do whatever you want with the code you receive with a subscription. But if you share the code, they don’t want you as a customer anymore and won’t give you new code. I don’t know if the GPL allows that.
This clearly goes against the intention of the GPL. Maybe not illegal.