Nah. You misunderstood. "They" don't make money on human time wasted. They make money on ads served. They don't particularly care if the ads were served to humans or agents, they get paid either way. Bot-traffic is actually good for tech companies because it inflates numbers. Capthas are not there to waste our time, but are there to improve their credibility ("We are certain those ad-clicks were real humans because the captha said so").