If you think this is simply "hosting" then you're out of touch with why it's interesting. Instead of being served from a central server ala a VPS or colocated box, or even a central server augmented with a CDN, it is instead served from a ton of geographically-local servers. Oh yeah, and it starts at free, with unlimited bandwidth. This is without getting into Workers et al.

Not a GitHub Pages user, also not a Palemoon user, so couldn't say, but Palemoon is niche. There's not even an official macOS version.