As a follow-up, I'd want to hear the writer's opinion on how to filter the corrupt kings from the "safe products". MailChimp and Squarespace are easy examples, but are name brand ecosystems like Steam and Spotify necessary evils, or would the writer encourage sticking with indie alternatives like itch.io and Bandcamp?
It is going slower than one would expect (or desire), but I do think technology is bringing us to an ecosystem that is more equitable for creators. Personally, I'm interested in the rules and expectations for tools that would be equitable to creators while remaining sustainable. It seems like there are offerings beyond web hosting and e-mail distribution that are worth exploring.
The author does not say you shouldn't use other kingdoms. To the contrary he says you should use the heck out of them. Just don't set up your whole castle there.