Yeah, I have the same issue. I did some digging and apparently Google changed it's policy and now the site first has to be verified or something. It says "Sign in with Google temporarily disabled for this app. This app has not been verified yet by Google in order to use Google Sign In."
From what I understand, Cash Music has to check in with Google themselves--
Tom Filepp on 14 Dec, 2018 12:04 AM
Hey folks--- we've had a ton of problems with Google Drive integration for a while now. I'll confer with the team to see if we can at least update this policy stuff, but just be aware that Amazon S3 is definitely much more reliable than Google.