I hope I'm wrong, but I believe that's for the cost of the request processing, not covering the traffic.
The free tier for traffic is "15GB of Data Transfer Out", after that it's 9 cents per GB. https://aws.amazon.com/s3/pricing/?nc1=h_ls (under "Data transfer"). Check your AWS bill!
The free tier for traffic is "15GB of Data Transfer Out", after that it's 9 cents per GB. https://aws.amazon.com/s3/pricing/?nc1=h_ls (under "Data transfer"). Check your AWS bill!