Really interesting point. I'm not exactly sure what I think would happen, but my intuition is that GitHub wouldn't turn off access to GitHub pages just for user

Really interesting point. I'm not exactly sure what I think would happen, but my intuition is that GitHub wouldn't turn off access to GitHub pages just for users on our platform - even if traffic was excessive. I think this generates a lot of interest in GitHub in general which is beneficial for them. But you are right, I believe a git based cms/blog that runs in some standalone fashion could be a v2 or v3 of this product. Or perhaps a one-off paid option if you don't want to use GitHub, you can pay to use our private git repo or even a git repo you host on your own.