That also, ofcourse. But on our own machines we can decide, and if you're like me, every computer in your house uses a flavour of Linux and you don't even think about pirated software or software licenses most of the time.
I hope that you at least think about donating back.
I know I do; I've bought every version of Slackware since I started using it a couple years ago (which, granted, has been, like, three versions, but still). I've also bought a few OpenBSD CD sets, though I've slacked off a bit lately.
I donate my time to various open source projects, translating.
If I set up someone's computer for them they get only programs for which they have licenses and FOSS stuff.
I don't usually get asked to set up computers more than once :)
I love when it gets to the part where they ask me how to download a youtube video as mp3 and I introduce them to youtube-dl, the terminal and a bit of .bash_aliases magic to make the youtube-dl command a bit easier. Their face: priceless =)
Yeah I would not show someone that! I wouldn't open up a friend to the copyright trolls...