how can people use linux when ....

there is a compatibility issue??

Are they not gamers?
They don't use general programs??
or are softwares actually compatible on linux??

>>29

GNU is not Unix.

But Linux is not GNU, no matter how much Richard Stallman whimpers that it is.  You can replace all the GNU-based OS tools with proprietary, closed-source rewrites and it will still be legal and legitimate Linux.