Several sites experiencing ReCaptcha"Invalid Site Key" error

It seems like start about two weeks ago, several of my clients are having the same issue. The ReCaptcha is showing this error message “ERROR for site owner: Invalid site key”. I’ve asked them all to configure it again, but as several sites are experiencing the same issue, I think there’s something else going on. There has not been any updates recently on any of the sites including the wordpress version and plugin version

That error comes directly from Google. I’ve also noticed it on a lot of sites not using Gravity Forms or WordPress. Google has most likely revoked a bunch of site keys.

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