Dear website owners, please, do not use reCaptcha. As was noted in other comments, Google discriminates against the users who try to protect their privacy by showing them nearly unsolvable variant. For instance, I see the hard version all the time since I started to use Privacy Badger for Firefox. It is also not impossible that they discriminate by user-agent.

And generally it is a very bad idea to choose the most popular service among the alternatives, as by doing so you are contributing to the centralization and monopolization of the Internet.