Eager is to give all of the non-technical website owners access to the JavaScript tools we use every day. If you do know how to install a script manually, there is certainly less of a reason to use it.
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.