Markey would have YouTube implement continuous "mechanisms" to identify any users under 13 (and thus limit data collection under COPPA). The site would also have to delete all data collected from under-viewers under 13, even if they're now older. Any future child-oriented product would have to be approved by an independent panel. Google would have to back a "consumer education campaign" warning parents against underage viewing, and it'd have to fund production and support for "noncommercial, quality" kids' content.
We've asked Google for comment. However, multiple reports have surfaced of the company considering multiple options to prevent kids from seeing objectionable content on YouTube, including limiting child-oriented videos to YouTube Kids or disabling autoplay on those videos. Those wouldn't be enough for politicians like Markey -- he wants to be sure that YouTube doesn't track those younger viewers, and is discouraging kids from watching YouTube in the first place.