I had honestly never heard of Netlify. I thought GitHub Pages was the standard, with S3 static hosting a second (more involved) option.
EDIT: Googling suggests Netlify offers a build, deploy, hosting pipeline all-in-one box. Which is substantially more than any of the projects mentioned here. These serve a single purpose - simple hosting of static websites.
that's a bummer. I thought now that we have private free repos, websites could be hosted there. Still nice feature. I guess, the public nature definitely generates some trust and also is a good way of showing your work as Github works like a project showcase platform too.