When Imgflip moved to Cloudflare they did require an enterprise contract if we would use Cloudflare as a CDN (lots of static assets, in our case .jpg and .gif).

When Imgflip moved to Cloudflare they did require an enterprise contract if we would use Cloudflare as a CDN (lots of static assets, in our case .jpg and .gif). The contract was a constant price per month as opposed to per-GB like classic CDNs. It's possible contracts are different now though Imgflip has been there a while.