I would be very surprised if any of the major Linux vendors even attempted to get a 'universal' Linux key. From the perspective of the major Linux providers, g

I would be very surprised if any of the major Linux vendors even attempted to get a 'universal' Linux key. From the perspective of the major Linux providers, getting logo certified is a competitive advantage against their peers, and it would take a significant amount of altruism to obtain those keys on behalf of others if it is even possible, which is anyone's guess. As far as the OEM providers, no, I don't have any sources to back that up, but I don't know how you could logically argue against the idea that RH logo certification will increase sales to RH customers.