That's because completely free means different things to different people. Does it include the firmware/bios? Are you only concerned with what runs on the CPU?
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Original Raspberry Pi needs user to provide non-free firmware blobs on SD card to even boot the CPU. That's pretty non-free in any meaning I can imagine.
It seems like it's still the case with Raspberry Pi 2.
The only difference between that an a PC is that the PC stores the firmware blob in a ROM chip while the Pi stores it on the SD card. Both require it to boot.