Why do all of these services want to manage the build? I already have CI, I don't need to use your service which probably doesn't have all of the tools I need. (Build environment linked below, how do they update it? Is it frozen or will I be screwed when they change it?) I must be missing some reason that they feel the need to do this.

https://developers.cloudflare.com/pages/platform/build-confi...

I currently use Netlify as it has a simple API to deploy a zip file or a slightly more complicated API to avoid re-uploading unchanged files if you have a big site.

https://docs.netlify.com/api/get-started/#deploy-via-api

I'm glad that Cloudflare is adding the option to be an origin for static sites, I would switch over if they added the option to just upload files to them without this CI/CD nonsense.