Agreed. It's especially ironic because Red Hat itself was so precious about reading in an incompatibility re the ZFS-Linux combination, and now it's parsing the words of the GPL so closely.
> There's a pretty clear argument to be made that RHEL's actions in ending business relationships with any customers would be a restriction stemming from their having exercised their right.
Disagree, here, though. An additional restriction on the exercise of rights, might be, "This/your license terminates should you distribute the source packages distributed to you." Future updates and support are not guaranteed in the world of the GPL, are not even mentioned, and, your rights are not restricted, when I refuse to do business with you. You still have a license to the software you received. And you can go do business with SUSE or someone else!