Google's reCAPTCHA makes it impossible to use large portions of the web once you take reasonable measures to protect your privacy. The challenge will continuously fail, despite you spending time to carefully solve it. This cruel behavior is described in a patent [1] by Kyle Adams of Juniper Networks. [1] https://patents.google.com/patent/US9407661
Now you're just training many Google machine learning algorithms by classifying data. In which they get more useful for the consumer, thus more powerful.