Telling humans and computers apart was never the purpose of CAPTCHAs, only how they initially worked. The name has been a complete misnomer for at least a decade now. Its actual purpose is, and has always been, abuse prevention. Has it been successful? Some yes, some no, and a lot of collateral damage. Its mode of operation now looks a lot like inscrutable blacklisting for some plus inconvenience and bad rate limiting for the rest.