Redis is a poor example because it is licensed under BSD which you can do exactly what you're describing. If you think there's something wrong with a corporatio

Redis is a poor example because it is licensed under BSD which you can do exactly what you're describing. If you think there's something wrong with a corporation (likely a few hackers) selling open source software and making money off of it then, well, you simply don't belong in open source. This is exactly how Redhat operates. But there's obviously a difference between making money (re-branding) and then attempting to re-license (or break the existing one, assuming GPL, by not contributing back).