It's kind of like the diet problem. You can buy the best food you intend to eat and keep it home. But you still eat the trash. But now instead of the computer helping you stay on track with what you intend to watch, your subscriptions, the junk foods just being shoveled down your throat because it gets better engagement.
Multiply that by every feed, every piece of algorithmic engagement, every search bar... People lose a lot of self-improve opportunities