Yahoo does not charge a fee for recovering an account. Account recovery is a free service provided to users who need to regain access to their Yahoo account. If you’re having trouble with recovery, you can use Yahoo’s Sign-in Helper to reset your password or recover your account using your recovery email or phone number. Yahoo may ask you to answer security questions or provide other information to verify your identity. Be cautious of third-party services that may claim to offer account recovery for a fee, as these are often scams.
Visit here: https://hackmd.io/@Hubinfo/yahoo-charge-to-recover-an-account