The "No" being a random combiantion of colors would prevent it form being picked up by color censors (I think), and also make it stand out enough for a eprson who is looking for it to find it. And sicne the "No" pops up in a random location on the screen, the bot can't simply click a specific spot. And if bots could avoid it by spam click every bit of the screen, the "No" could even float around (but not so quickly that a player wouldn't be able to click it). Bots can react to dynamic situations, such as entering in a pin number. I'm sure it would be able to handle this.