You don't leave forensic evidence of the attack. You don't have automated IDS systems blacklist your IPs. You get a one-to-many leverage on the backs of Googl

You don't leave forensic evidence of the attack. You don't have automated IDS systems blacklist your IPs. You get a one-to-many leverage on the backs of Google's prodigious crawler farm. You potentially goad the target into manual or automatic decisions which penalize Google, thereby inducing Google to automatically retaliate with decisions which inflict business damage upon the target, which may be a goal of the attack. etc, etc.