Google sells, and more frequently gives away the use of reCAPTCHA to protect your web site or web pages from bots. When their algorithm suspects you are a bot or that you are abusing a site with a lot of traffic, they challenge you with a problem to solve that is difficult for a bot.
These challenges and the problems are usually image classification problems that help Google improve their image classification algorithms. These human judgments the world provides to google are called "labels" in machine learning.
Now, Google is selling the use of those annoying reCAPTCHA challenges that billions of people perform for them for free. If you need your datasets labeled by people challenged by those annoying "I'm not a bot" prompts, you can sign up and pay Google for their free labor.
Brilliant!
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