It sounds like a bill hasn't been proposed yet (if it has, I'd be interested in a link). Let's assume legislation like this passes though. Could some anonymous account upload copyrighted material some other malicious person created to a website like YouTube and have YT shut down as a result? Could this be automated too, and put such a massive burden on the website that it can no longer operate? Is this what is being proposed? If so, half of me wants to see the storm that ensues and the subsequent investment by all major tech companies in increasing internet anonymity, especially around hosting (but it'd probably be better to avoid needing to change the entire internet in the first place).