Watch some Leonard French videos on YouTube. He’s a copyright attorney that often fights cases that hinge on said bookkeeping. It’s pretty broadly acknowledged by people who work these issues that sloppy bookkeeping is the norm, not the exception. If you think about it, it makes sense, especially if you’ve ever worked for a large organization. Copyright policing doesn’t make AT&T any revenue. They half-ass it so they aren’t sued, and because there is little counter-incentive to “doing it wrong.” They don’t have to do it “by the book” because there is no book. Sometimes that breaks in favor of infringers. Most of the time? It’s a mess. But the trends are there and there’s no reason to assume that they wouldn’t apply here.
@_osivot kind of has the right idea that AT&T isn’t likely full-hearted in pursuit of any banning policy because they have no incentive to be beyond a Viacom/Disney/Whatever lawsuit. They’re wrong that there’s sufficient competition in the market to swing anything dramatically, however.