As anc84 said, it's about guaranteeing future freedom. Like making sure that the code I spent hours on to contribute to your project for free isn't going to be

As anc84 said, it's about guaranteeing future freedom. Like making sure that the code I spent hours on to contribute to your project for free isn't going to be taken by another company and incorporated into their closed-source product to compete against the project I'm working on or just contributed to without the company contributing anything back. That's one of many reasons someone may take issue with you choosing a more permissive license and not wanting to contribute as a result. Like lots of open source folks I know, I'm personally a fan of the underpinnings of apps/servers as well as libraries being permissive (BSD/MIT) so that everyone can contribute/benefit but full applications being GPL. To each their own, of course, and there are many rationales for differing views. But please don't belittle others' takes on what they choose to do with the effort they put in.