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AWS C++ SDK uses it to access AWS. Probably some other AWS SDKs as well. That amount should have been at least 10x and recurring.

That's a bit overstated. Although curl wrappers exist for most languages, they're far from popular or consensual in each individual community.

What's "overstated"? Literally every single API request in C++ AWS SDK goes through libcurl.

And atleast compounding as well. /s