This just helps the botters, because every time someone comes up with something new the programmers will adapt and improve their techniques. It’s an arms race, which can only be won by those who write bots.
Why? Because at some point that race ends where botters use sophisticated AI trained to beat any and all obstacles. When a human brain can do it, an AI will eventually be able to do it as well. It just needs the proper training, which only needs to be done once.
Not even using a webcam and forcing people to accept being filmed is an effective strategy against botting, because people could feed the webcam with a pre-recorded video or, hell, nowadays even create the whole person and movement at runtime.
There are DeepFakes for Faces, DeepFakes for Voices (is there a term for this) and in 2019 it doesn’t take years to render a realitsic looking person for a webcam feed.
The absolutely last thing one wants to do is an arms race against them.