There's a difference between using open-source in your work and doing a superficial fork & rebrand. The latter is clearly trying to steal the upside from the creator of the code.
Of course there is a difference, but again that's what I love about open source. You put something out there, and then it has a life of its own. So what if some people come along and try to sell your code with a new name? Good luck to them, I hope they become very rich off my code (are there any examples of this actually happening?). Personally I write open source code because I like writing open source code, not to get rich.