What if the metric driving your stock is engagement and you've managed to somehow maximise it? How do you continue to grow when there's a finite number of peopl

What if the metric driving your stock is engagement and you've managed to somehow maximise it? How do you continue to grow when there's a finite number of people in the world and a finite number of hours in the day? There's also a finite number of ads you can show before you've enshitified your product and start shedding users, and a finite number of ways you can make efficiency gains when it comes to serving them (including layoffs).