Because... ? If I'm operating a site, and I want $X to allow a bot to scrape my site, why shouldn't the bot be allowed to make the purchasing decision to scrape the site? Obviously the bot owner would have their own set of guardrails, but if it allows sites like The numbers to stay up because bots aren't going to look at ads so the old model of displaying ads isn't going to work, I have a hard time seeing that as a bad thing.