It's an internet attitude alas of many people; we've had here good discussions about IP (intellectual property).
But many people on the internet are thinking that all they can find (as images, movies, music etc.) on the internet can be re-used by them freely. Or should be available for free.
It's this kind of attitude that some try that you'd also should share physical stuff they think you've enough off.
That would be the day, when I walk over to the baker and say 'hey, you have enough bread. You cannot eat it all, so give me some freely'.