I could easily edit posts to redirect to a whole new blog. The blog isn't old enough to be that big of a hassle. This is really about the openness of platforms

I could easily edit posts to redirect to a whole new blog. The blog isn't old enough to be that big of a hassle. This is really about the openness of platforms. If you operate on even a moderately open platform (e.g. allowing 3rd party javascript), then the risk of platform collapse is a minimal risk to your data. That is the biggest risk with Facebook. They aren't inclined to be open with my data, so i don't bother using it. Blogging platforms don't work unless they are open. You're definitely right about the subdomain though.