They didn't invent Yum either, so I don't see how NIH applies.
Fallback mode seems to be going away soon.
The majority are still using Windows XP.
Win 2K was "Cairo" in the same sense that Vista was "Longhorn" and Mac OS 8 was "Copeland". In other words, no, not really.
You forgot 3.11.
Just tell them they have to put it in the drive and reboot to get the free porn.
It's GPL/commercial licensed; the concern is over the former MYSQL AB.
MySQL is dual-licensed, and IIRC the commercial side and it's support business are the holdup. Think of it this way: Linux may be free, but if Microsoft put in a bid to buy out Red Hat tomorrow, do you think the regulators wouldn't care?
The majority of the kernel files contain no license information except a copyright notice, meaning no permission to distribute them exists beyond the COPYING file (GPLv2 with "clarifications"). It seems to be more of a "developer's choice" thing than anything else.