could this be useful for embedding info in server generated web pages that are then picked up by a JavaScript. e.g. a tom-select country picker that gets its data from an embedded RX structure?
That post reads like fully LLM-generated. It's basically boasting a list of numbers that are supposed to sound impressive. If there's a coherent story, it's well hidden.
Open systems provide plenty of opportunity for smaller businesses to provide innovative and convenient services. What kind of innovation and experimentation other then getting more ads in are the gatekeepers that we have today interested in doing as long as there's no competition?
I've found https://dokku.com to be a great (self-hosted) alternative to heroku. For hobby and small company size a cheap root server will do great. I've been running one at Hetzner for ~5EUR/month for more than a year now and had a very smooth experience.
An option that I like to use is Middleman (or any other static site generator) for creating the pages and Netlify for hosting, all for free even with your own domain and HTTPS.
You have nice static HTML pages with a CDN, super fast, and there's even a CMS option with NetlifyCMS, which works by creating git commits for you and then automatically pushes the new static version on Netlify. The basics in Netlify are free and there are nice add-ons where some are also free (e.g. forms).