That is a terrible idea.
Based on the description this doesn't affect me. I guess there are plenty of people who are happy with their service overall.
Of course it effects you, unless it's possible to keep your own copy of the javascript and never let them serve you another (a practice I doubt you were employing). Every time you open up that site in your browser you're hoping that someone doesn't give you malicious javascript. It doesn't have to be on their end; if someone is able to compromise your communications channel they can serve you any code they want. And by 'they' I mean USG.