But it's not just teenagers, it's also adults who are harmed by overexposure to algorithmically presented content. Obvs we can't restrict adults from legal content but we can legislate against algorythmic content.

The NPR bit sounds like what I'd imagine I could expect from people who are very good at pushing junk food -they've got good science behind flavoring and light addiction (like you don't get withdrawals from not eating doritoes) and the same with social media. they have very good science behind getting people to spend more and more time viewing their content not matter what. So I take that bit on NPR with a grain of salt. In my experience, NPR often presents studies based on small samples for whatever reason. Maybe to go against the grain, maybe to get people to think, who knows...