By that I mean, the vast majority of contributions are sponsored by corporations.
Both Linus and Greg know that. They are keenly aware that if Linux takes a hardline GPL approach it will gain the reputation of being unfriendly to corporations. That perception will kill Linux in the long run.
When they say they "Care about Linux more than GPL" they are really saying they care about corporate Linux since non-corporate Linux virtually doesn't exist anymore.
I have nothing against that and honestly I think they have more clear opinions due to their positions as top-level maintainers. I just think the motivations and incentives behind their opinions should be clear to more people.
The people's Linux is virtually dead. People need to eat. An analysis of that phenomenon would be interesting as well but is beyond the scope of this discussion.