Yes and that is a very bad thing for the rest of the world. Time for non-us companies especially ones not doing business in the US to migrate away.

It is perfectly normal for an anycast network operator to have multiple sites from which they make BGP announcements (which is how anycast works in the first place), which gives them multiple vantage points for this sort of analysis.

Other CDN companies can do it too, it's just that they don't work on signalling their engineering focused organization.

You don't have to be cloudflare for this kind of analysis you can do it yourself without even needing an ASN using RIPE RIS.

https://www.ripe.net/analyse/internet-measurements/routing-i...

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They have a lot of resources, Cloudflare Is Awesome