Backblaze B2 + Cloudflare would be a perfect combination for hosting a static site. Unfortunately there's no way to map a Backblaze bucket to a domain, so even if you use cloudflare to point www.mydomain.com to it your files still show up at www.mydomain.com/path/to/bucket.
But it certainly works if you need to CDN a bunch of large files.
But it certainly works if you need to CDN a bunch of large files.