When the recaptcha response is anything other than perfect success, the module reports an error to watchdog.
But many of those errors are just recaptcha doing its job - they are not errors, they are successes. And you can get a LOT of these messages gumming up your logs, hiding real errors.
Hard to do in a test bed, but trigger a few errors, like waiting too long to respond to the recaptcha challenge. Or fake some. See that the non-success responses are all logged as errors, regardless of type.
Permit developers to specify that some types of error should be reported as WATCHDOG_INFO, instead of WATCHDOG_ERROR.
Patch. Would be good to add something to the readme.
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See also https://www.drupal.org/project/recaptcha_v3/issues/3361927 ✨ Custom error logging Active for a more refined version of this approach.