Any developer regardless of open sourcing their work or not automatically gets copyright for whatever they write. That is in fact how they're even able to assig

Any developer regardless of open sourcing their work or not automatically gets copyright for whatever they write. That is in fact how they're even able to assign a license in the first place. I also think you're misunderstanding the FSF. Nowhere do they say that selling software is bad, in fact they explicitly say that you can sell your open source software, and also note that it's free as in freedom, not beer. The real argument is that open source is not a business model. Just because someone writes OSS does not mean they will automatically make money, because again, it's a distribution model, not a business model. There are plenty of OSS that make money because they focus on the business and marketing side instead of only the developer side. That most devs don't want to do that and prefer to write code does not justify their crying when no one pays for their free product.