Unfortunately, I can't eat from the benefits to society...
Honestly despite what he says, it feels like a contradiction. To paraphrase: "It's sad most creatives can't make a lot of money, so let's give them nothing at all."
And to supplement writing income, some authors already are teaching or selling classes like his jazz musicians.
The open source software comment is rather tone deaf as well. People have been leaving open source development (myself included) simply because we still need to eat, and nobody would give us any money. If an open source project becomes popular, companies will cannibalize your revenue streams where the license allows. Otherwise, bigger projects tend to have corporate sponsorships / paid developers anyway.
Of course, in software, there will always be those who espouse freedom and want to share, for free, on principal. The same is already true of books -- tons of people are giving away books for free.
Honestly, let's not talk about how predatory academia is. People who write papers often have to pay out of their own pocket for peer review at worst. At best, they don't get any money for sales of articles despite the fact that the big journals charge access to the papers. Sometimes they get government money for the research, so I'm a fan of requiring publicly-funded research to be publicly-available. The Meta guy is a clown.
But the only way we can really release our work for free is if we're supported in some other way. Whether that's another full-time job, supportive spouse, or some magical universal basic income that will probably never materialize.