I suspected (perhaps like you) that this article was going to be about free hosting providers (Netlify and the likes). When I saw it was Disqus/Facebook/Twitter I wasn't too surprised. I also host a lot of projects "for free" (TM) on Netlify, Firebase, etc. and don't tend to include any 3rd party scripts.

It makes me wonder if some form of data (anonymous or not) scraped from folks like Netlify is slated to be sold off to advertisers or SaaS products looking to find customers. As they do things like process your HTML they could pull out textual content looking for signals.