Netlify is an outlier in this comparison. For them, static site hosting is their core product, bread and butter if you will. To have such mediocre performance, as well as a relatively bad time to first byte is quite surprising.
The real disappointment here is Cloudflare, which manages to be among the slowest despite their supposed focus on performance.
Google Cloud Storage manages to be significantly faster than Cloudflare, while serving files publicly is "just a feature" (like for S3, which trails the pack).
And Netlify is also a disappointment because they are supposed to be all about hosting static websites, and their performance is poor for doing just that.