Different licences... that's the reason that Apple and Sony uses BSD instead Linux.

In Linux any app/code created using the Kernel have to be OpenSource... that's different than free... you can price your app like in Windows but you have to publish the code that you create for the community... so any expext can compile the code and run the app after all.

Now BSD not... you can make code in BSD and maintain closed.

BSD licence is way more pro-"proprietary".

BTW Open Source and free are different... I can charge for Linux OS and Linux apps like in Windows.

Hmm, obvious choice. They needed an existing OS because they can't make one on their own. They needed an OS where you can do what you want while relying on the brainpower of others without giving anything back.
They needed a sleek OS without much stuff unnecessary. Of course they also could've used netbsd or openbsd but they are going for other goals than freebsd. Could still mean that's good for hacking-efforts ;)
But really, by now this is news-worthy but that's all. They had and most probably still have a lot to do in the user-land apps. Let's hope they don't violate the GPL of other software while developping stuff for PS4.

People alway say Android OS. In fact Android smartphones are linux based. Android is a Java aplication/framework and somethig more, but still - your Samsung runs Linux OS.

I think if there are any OS in the world today created from zero... every OS is based in cores alreadys created before... nobody creates the wheels again.

True .

Android is a Linux running a custom JVM... that is main reason it needs strong hardware and the battery management is meh (the JVM needs to be always up using OS/CPU resources).

Both Linux and BSD uses the same Unix core guys... they are similar and most apps on Linux works on BSD.

freeBDS (KDE)... you will say it is a Linux (KDE) with Firefox, Thunderbird, etc apps lol

Yeah.  There's a huge abstraction when using Direct X APIs.  It doesn't talk directly to the hardware.

I guess so... consoles games are way more optimized than PC games (one needs to run in diffents specs and other only one spec).

Here the Carmark twitte... March 2011... not too old.

@Deepo Consoles run 2x or so better than equal PC hardware, but it isn’t just API in the way, focus a single spec also matters.

— John Carmack (@ID_AA_Carmack) March 22, 2011

Thanks. Then you certainly can't build a comparable PC for very little money.

abstraction - is a key word in this PC/console discussion.

Both PC hardware and PC software suffer on performance and gain on compatibility because of lots of abstraction layers.

(sorry for poor english - please correct me if it sounds too bizarre)