Do CDNs bill the cached bandwidth? I have an image heavy website and according to my free Cloudflare analytics, it had 30 GB uncached bandwidth &amp; 3.5 TB cached. Suppose I migrate from my VPS to AWS s3 &amp; Cloudfront. Will I have to pay for 3.5 TB bandwidth per month? If I run that number through AWS calculator it gets over 300$ which is extremely pricey.