I actually switched from AWS/Cloudfront to Cloudflare because pricing isn't based on bandwidth and I have greater control over security and access (firewall, rules, etc)
I had a string of sketchy accounts using my SaaS service as a file host which ran up a bill of about 1.5k. Obviously I put some safeguards in place (firewall, rules, alerts), but the scenario you're mentioning does happen and is largely mitigated by using a service with a pricing model like Cloudflare's.
I had a string of sketchy accounts using my SaaS service as a file host which ran up a bill of about 1.5k. Obviously I put some safeguards in place (firewall, rules, alerts), but the scenario you're mentioning does happen and is largely mitigated by using a service with a pricing model like Cloudflare's.