As far as I understood the problem with Captcha was and is that it is too American not in a bad sense but culturally. People coming and using the Internet from developing countries might not be able to solve Captcha because their culture is different.

I was thinking how to solve this problem and I came to the conclusion that it is very hard to design puzzle for every country in the world so I decided to put them in cultures something like Civ game but then again the whole process of solving Captcha should be easy not exhausting and time consuming.

My solution was to use webcam if available and make people wave hand or some other gesture in order to verify that you are really human. You can detect webcam presence and webcam input very easily. Or if mic is present you can use mic and pronounce some sentence in order to verify that you are human. As well as webcam you can detect mic presence and mic input easily so Captcha can not be cheated by automated bots.

My solution is humane input as solution to the puzzle or to the task not observing pictures and writing down the text because every computer bot can do it just as good as humans or even better.

Captcha should be easy to do for humans, easy to verify but hard to solve for bots.

In my opinion depressing Captcha is not the problem the problem is that bots came to the point where they are as good as humans solving Captcha but some people struggle solving Captcha because they are not familiar with American culture or simply they do not know English.