I know this has been asked on other platforms. But they are always answered by people who have nothing to do with Cloudflare
In short, they don’t.
My best guess is that 18.104.22.168 has many purposes. Cloudflare need good data on what is happening on the broader Internet, and a public resolver is one good way to gather that data. Marketing and brand awareness is another reason to offer such a public service. Also, using the 22.214.171.124 resolver means that queries for Cloudflare Authoritative zones are very fast, which means Cloudflares paying customers see a (small) performance improvement without the customer needing to do anything, which is always a win.
And never forget that Cloudflares mission is to Build a Better Internet, and offering a Privacy First, Fast and Free public resolver service furthers that goal.
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