ISPs don't care much about correctness at all if it impacts performance on their side in any way. That's why many people can't actually change their DNS even if

ISPs don't care much about correctness at all if it impacts performance on their side in any way. That's why many people can't actually change their DNS even if they want to (unless you run a local resolver)[1]. [1] - https://news.ycombinator.com/item?id=13037858 https://news.ycombinator.com/item?id=13037858