So the thing is yes there are lots of GPL violators out there, but not as bad as you imply. You'd be surprised how many of the android graphics stacks have fully open source kernel drivers, even if they aren't upstream, they are still released under the GPL, and there are a lot of people doing GPL violation works with those companies in secret.
The reason this one is bigger is (a) it was on lkml, (b) the company alleged to violate also happen to maintain a GPL fork of their code, (c) the company in question stonewalled any polite inquiries in private, (d) it was on lkml. (d) it got into phoronix.
Generally with GPL violations the organisation doing the investigation and the organisation doing the violatiing, talk in private a lot first, and some agreement is hammered out, occasionally it goes to court.
At a guess this one will probably go into the background, until
a) some rights holder decides to pursue it, whether that be SFLC, Red Hat, or anyone else who holds kernel copyrights
b) the company just releases the source to the bits they didn't before.