I felt you could see this be figured out in real time, if you looked at how people spoke online. You had many phases online, like the Libertarian phase, and people constantly talking about capitalism being great, and markets being great etc. Then you had 2008, and people started learning about things worked, and you started seeing people and different age brackets coming to terms with their reality and agency.
The agency that had previously been defined in market terms! So with everything from anonymous to flash mobs, people put two and two together and figured they could boycott things that they disagreed with.
The only time this became an issue is when it started exerting ACTUAL social force. At that point people had to have the difficult conversation of what people were mad about, AND the new manner in which people were exerting force.
As is inevitable with any use of force, it gets enmeshed with other people who weild force and power and it becomes just another thing that is seen as oppresive and broken.
But its essentially effective (or ineffective) social boycotting.
It's about destroying people and tearing them down in order to make examples of them. It results in antagonists showing up at people's homes, writing letters to employers, creating petitions, attacking people in the nastiest ways possible with out engaging with ideas or arguments.
It's the disproportionate and graceless reactions that distinguish cancel culture from past methods of accountability.
A quick search shows that others have made this connection between Altman and lowercase and non-AI authenticity: https://ted-merz.com/2023/12/18/writing-in-lowercase/
It looks like this particular blog previously used conventional capitalization from 2017 to late 2023. The first post in this style appears to hint at a kind of shift in identity of the author, so perhaps, in this instance it is more a signal of personal expression or tribalism than non-AI-ness. Then again, we may see the line between the two continue to blur.