I think this paragraph on the difficulty of building good independent indexes should not be overlooked. What's going on with Cloudfare?

> When talking to search engine founders, I found that the biggest obstacle to growing an index is getting blocked by sites. Cloudflare is one of the worst offenders. Too many sites block perfectly well-behaved crawlers, only allowing major players like Googlebot, BingBot, and TwitterBot; this cements the current duopoly over English search and is harmful to the health of the Web as a whole.