The biggest concern I have is their recommendation algorithm, and that's where your "internet" analogy sort of breaks down. In the past, it had a tendency to quickly lead people down rabbit holes of extremism or conspiracy theories, because it was optimized around increasing engagement. Getting someone agitated is one of the best ways to keep them engaged. For a long time, the only thing Google cared about was keeping people on the site and viewing ads, because ads -> $$$.
It's not only Youtube, but they're one of the biggest and highest-profile examples. Worse, they had known about the problem for years, before they tried to do anything to counter or mitigate the problem. In my opinion, they still haven't done enough. Maybe we can't rely on them to self-regulate.