Previously, Google has said that the data captured from reCaptcha is not used for ad targeting or analyzing user interests and preferences. After this story was published, Google said that the information collected through reCaptcha will not be used for personalized advertising by Google.

"users are not able to fully understand the extent of the processing operations carried out by Google and that ‘the information on processing operations for the ads personalization is diluted in several documents and does not enable the user to be aware of their extent."

Now, if you intend to serve personalized ads to users, you’ll need to ensure that explicit consent to ad personalisation is collected before you can display personalised ads for end-users (where this consent is not collected, Google will default to serving non-personalized ads, potentially impacting your ad revenue).