Earlier quoted context omitted.
What do you mean "fully owned"? There is no mention of that in the post Edit: I guess you mean the content itself is still on your machine if the services go away, and you can choose to host them elsewhere
I don't think there is a good term in the context of the Internet. Or offline for that matter. Even if you printed your blog and handed it out on street corners, for it to be "fully owned" would that mean you make your own ink and paper?
But, I think using the term "fully-owned" to refer to pushing up to GitHub, then deploying to Cloudflare Pages is definitely not "fully-owned"