This is not unusual, there are many cases of GPL violations out there and if someone puts energy into them they are solved. Harald Welte and gpl-violations.org [1] have been doing good work for many, many years in this regard.
From their about page:
"By June 2006, the project has hit the magic "100 cases finished" mark, at an exciting equal "100% legal success" mark. Every GPL infringement that we started to enforce was resolved in a legal success, either in-court or out of court."
gpl-violations.org is in an extraordinary good position to help when it comes to GPL violations in the Linux kernel, because they work closely with some kernel developers that
"[..] have transferred their rights in a fiduciary license agreement to enable the successful gpl-violations.org project [..]"
Their website looks a little bit outdated but from what I understood from a talk that Harald Welte gave last year[2], they are still active. If someone wants to report the Onyx case you can do it at license-violation@gpl-violations.org but be prepared to provide solid information[2].
From their about page:
"By June 2006, the project has hit the magic "100 cases finished" mark, at an exciting equal "100% legal success" mark. Every GPL infringement that we started to enforce was resolved in a legal success, either in-court or out of court."
gpl-violations.org is in an extraordinary good position to help when it comes to GPL violations in the Linux kernel, because they work closely with some kernel developers that "[..] have transferred their rights in a fiduciary license agreement to enable the successful gpl-violations.org project [..]"
Their website looks a little bit outdated but from what I understood from a talk that Harald Welte gave last year[2], they are still active. If someone wants to report the Onyx case you can do it at license-violation@gpl-violations.org but be prepared to provide solid information[2].
[1] https://gpl-violations.org
[2] https://www.luga.de/static/LIT-2019/events/84.html
[3] https://gpl-violations.org/helping/.