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Because they save us ~20 thousand a month in bandwidth cost.

We got 10k visits in a single day. Cost of data transfer: zero

Really zero, like non of the visitors was hitting the original servers? That would be impressive then. And you should consider to make money with delegating the traffic, not give away the traffic for free.

I mean, I did not went into the rabbit hole of checking thoroughly, but in cloudflare it says we served 8gb and aws says we served just a few megabytes.

You configure to ignore everything, even the url querystring, and worst case scenario, they serve your site from an internet archive snapshot. You can literally power off your server and the page stays online

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