I think that’s because the software comes from a similar place. You have to fight for your freedom and it takes effort, and the people that put that effort in like to feel good about it by sharing (or showing off). It’s like gym-goers who like to show their hard-earned progress.

And then there’s the fundamental differences in core philosophy, where a lot of friction between open and closed source projects comes in. It’s warranted, but I get why it’s annoying.