Idea and or Suggestion: AFK/Bot challenging

I know I speak for everyone when I say we hate Bots and AFK players. What if when you suspect someone of being a bot, a captcha pops up on their screen the next time they open shop or die or go afk for five minutes. The captcha would be simple enough so anyone can solve it in a quick manner so it does not hurt them.

(Maybe if you fail the captcha you get another one, and you get three tries before it either temp bans you or restarts the match? or something happens). The specifics you lovely people can work out, and I apologize if this was already suggested and or this is not the right board for this sort of post.