There certainly is some benefit of this, but the barrier for bots is low. All it needs is a custom bot that can be written in minutes. Because it seems to use

There certainly is some benefit of this, but the barrier for bots is low. All it needs is a custom bot that can be written in minutes. Because it seems to use a fixed set of question types. All of which a simple script can solve. Example: What is Mark's name? Writing a script that extracts the name from this string is trivial. And the other question types are similarely easy. The next step would be to allow the site owner to put in domain specific questions. For example a chemistry website might ask "What is the formula of $moleclue?". And then provide ['Water'=>'H2O','Salt'=>'NaCl'...] as questions. Then the site would be protected from a general textcaptcha solver and bots would have to be customized for each domain.