Typically the code in the hacker’s delivery system / hackerbot user agent has a built-in check for 403 errors / being blocked and will move on to unprotected targets / sites either on the first round of being blocked or on the second or third rounds of being blocked.
The general idea is to hack websites in volume – ie hack 1,000′s sites in a day and then sell those hacked sites off on the black market. A hacked website is typically worth about $.15 to $1 dollar on the black market so to make any money selling hacked sites off the hacker has to have a large volume of hacked sites to sell to make it worthwhile / profitable. The point is the human hacker’s delivery system is designed not to waste resources and move on to easier targets fairly quickly. It would be a waste of resources for the human hacker to attack a protected target.