You know, if I've noticed anything in the past couple years, it's that even if you self-host your own site, it's still going to get hoovered up and used/exploited by things like AI training bots. I think between everyone's code getting trained on, even if it's AGPLv3 or something similarly restrictive, and generally everything public on the internet getting "trained" and "transformed" to basically launder it via "AI", I can absolutely see why someone rational would want to share a whole lot less, anywhere, in an open fashion, regardless of where it's hosted.
I'd honestly rather see and think more about how to segment communities locally, and go back to the "fragmented" way things once were. It's easier to want to share with other real people than inadvertently working for free to enrich companies.
How is this worse than a human reading your blog/code, remembering the key parts of it, and creating something transformative from it?
The whole point of software engineering is to do stuff faster than you could before. It is THE feature. We could already add, we could already FMA, we could already do matrix math, etc. etc. Doing it billions of times faster than we could before at far less energy expenditure--even including what it takes to build and deliver computers--has led to an explosion of productivity, discovery, and prosperity. Scale is the point. It changes everything and we know it; we shouldn't pretend otherwise.