For now on Google's Recaptcha service can be classified as an *#Advertising Network* - and no longer as a Service Provider.
Fun Fact: #Google Policies admits Re-Captcha's http://gstatic.com is specifically used in Ads products @ https://policies.google.com/technologies/types?hl=en-US
"We use various domains to set cookies used in our adv products, including the following domains..."
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