Introducing DNS Resolver for Toranonfile (31)in #tor • 7 years ago OH NO NO NO inhales https://blog.cloudflare.com/welcome-hidden-resolver/
Do you think Cloudflare has an undetectable Tor exploit and uses it to identify people who use their DNS service?
Cloudflare's reputation would be hurt in a way that far outweighs the gain. Government agencies' reputations aren't very important.