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How is this data collected? I can see how they would be able to get statistics from clients hitting CloudFlare servers, but how can they report on the traffic hitting google.com or microsoft.com?

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I think that might just be based on their public dns service (https://1.1.1.1)

They can tell bots and DoS traffic from the DNS request?

I'm guessing the different metrics are collected through different means. Their blog mentions HTTP request to sites that use cloudflare as well as DNS [0]. It would make sense that domain popularity is meaused through DNS and bots and DOS measured by the systems built for handling those things.

[0]: https://blog.cloudflare.com/introducing-cloudflare-radar/

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