Thanks for linking. I re-read that article just now, and I interpret it differently. In a completely abstract view, GPL indeed says nothing about money. However, there's a reason the very article you linked exists - GPL exists in the real world, world defined by money and markets. As such, the article reminds us that being able to sell the software is a part of the end-user freedoms that Free Software protects. The article in fact explicitly recognizes people need to make money, and encourages them to try making money on Free Software.
My claim here is that Stallman and the FSF have a very realistic view of the world. The Free Software isn't about empowering individuals - it's about empowering communities. And communities, in the real world, always have some form of internal economy - be it favor-based, gift-based or money-based. They have a form of specialization of labor. They're also embedded in the larger local and global economies, and to survive, they need to be productive participants. Free Software isn't preventing people from making money on software - it's just counteracting the natural tendency for software to turn into capital and concentrate in the hands of the few. That is, it protects people's ability to make money via the software (should they choose to) from the interests that would build on it, establish exclusive ownership, and use it to seek rent.
FWIW, this became clear to me when I started to look into what the "right to repair" movement is really about. There's a common argument against RtR, that's very similar to a common argument against Free Software: that it assumes or mandates everyone to be a specialist able to fix and improve their devices on their own. But the RtR crowd had a very clear counter to this: it's not about you becoming a hardware engineer so you can fix your own devices. It's about you being able to get a friend, or find a local repair shop, and pay them to fix your device for you. RtR is also expressed in terms of individual freedoms and seemingly orthogonal to monetary issues - but it's been made clear all this is primarily about making the economics of local community repairs work.
Once I grokked that, I realized Free Software has always been about the same thing, but for software.