> Why? I mean, if you're that hostile to collaboration, why not just keep it closed source and maybe try to charge for it? - There exist open source licenses

> Why? I mean, if you're that hostile to collaboration, why not just keep it closed source and maybe try to charge for it? - There exist open source licenses (with copyleft) that disallow making it closed source. - There exist other reasons to publish the source code: for example allowing the user to study it.