[gnulinux]

This is a horrible argument. What gave Google the right to be the moral authority of the internet (we, we did)? Even if 99% of exits from tor nodes are malicious, Google should have absolutely no capability to throttle this traffic. Unless you claim most of the traffic in tor are from bots, your argument doesn't make any sense. Captchas serve 2 purposes: slowing down bots, annoying humans. By putting captcha to tor exits, Google not only slows down miniscule amount of bots, but also annoys human traffic (good or bad). It is by no means a "good" thing that Google is capable of this.