About the minimum number of instances of AWS App Runner during normal times

A web application built with App Runner automatically scales up in response to requests, but as long as there are no requests, the number of instances will automatically be zero and the memory will be zero, so will there be no costs during that time? Even after reading the documentation, I still couldn't understand it. https://docs.aws.amazon.com/ja_jp/apprunner/latest/dg/what-is-apprunner.html