I wouldn't really consider these "keys" or "secrets", they're more like a user identifier. Having them probably means you can now write another app to access the same data... and if that was in any way considered a security issue, it wouldn't be solved by not having those identifiers in the app either.

(Of course there might be some APIs that allow doing more by interacting with them directly than what the app originally allowed, but I think those are just cases of bad design.)