There is zero reason to do something like this (if you're doing it at all) with a chunk of javascript hosted by a another party.
I'd also advise anybody installing such scripts (even locally) to read them to make sure that they only do what they say they do.
If you do read the Eager terms of service, you'll see that we explicitly guarantee that we won't sell any tracking information. We don't build every Eager app, but the ones we have built are open source, and don't track or report anything to us.