It seems like this would bring all of the problems of other CAPTCHAs, but with the additional problems of excluding the visually impaired as well as those who c

It seems like this would bring all of the problems of other CAPTCHAs, but with the additional problems of excluding the visually impaired as well as those who can't see optical illusions (which is as high as 20% of the population, depending on the specific illusion). And would it really be effective against bots? It isn't obvious to me why it would be any more effective than other schemes.