How do you know how many bikes are out there in total? And what is a purpose of a deliberate labor slowdown if you are going to get more captcha work if you do

How do you know how many bikes are out there in total? And what is a purpose of a deliberate labor slowdown if you are going to get more captcha work if you do not finish your current one. I mentioned DDOS because every time you fail to satisfy captcha criteria website requests a new batch of captcha for you; in that way you would be constantly requesting a new captcha if you would be deliberately failing your current one or as you described imposing a "hunt limit" upon yourself.