Curl has been delisted from Microsoft NuGet
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In a past life where I had to deal with a lot of .NET libraries from awful enterprisey vendors, it was often easier to pull down versions uploaded to NuGet by 3rd parties than use the official installers. In retrospect this was pretty dumb of me from a security perspective...
Was the exceptional circumstance that someone uploaded packages that didn't belong to them, was it that it wasn't maintained, or was the exceptional circumstance that it was a high profile application with a large twitter following.
I can't imagine that Microsoft would do that for me, if I had a third party upload and abandon a library and I could not contact them.