"Technically any hosting provider can do this for any online platform."
Not really? I host my website on Fly.io but they can disappear tomorrow and I will just change my DNS records. (Registry and registrar are strictly regulated.)
Likewise, my newsletter is on Ghost but I can take my subscribers with me unilaterally.
If chinwag.org goes offline though, you can't move your followers. Whether that's intentional or not.