Edit: This question attracted way more interest than I hoped for! I will need some time to go through the comments in the next days, thanks for your efforts everyone. One thing I could grasp from the answers already - it seems to be complicated. There is no one fits all answer.
Under capitalism, it seems companies always need to grow bigger. Why can’t they just say, okay, we have 100 employees and produce a nice product for a specific market and that’s fine?
Or is this only a US megacorp thing where they need to grow to satisfy their shareholders?
Let’s ignore that most of the times the small companies get bought by the large ones.
Because they run out of “create” and they’re slaves to the quarterly report.
A new company that makes/sells a widget that is desirable will grow naturally from the demand for the product. It has to get bigger to manage the demand. They go public to get more money to grow more quickly. Those public investors expect a return on their stock investment purchase.
Now competitors show up. Competition is bad for our big startup (despite being a supposed tenant of the free market that allowed our company to grow quickly in the first place) that is now a major power in the widget industry. You can only make the widget so many ways, can’t really improve it, and the market is becoming saturated. So what happens next? WidgetCo’s stock is flat! Investors are mad! The CEO is in trouble! Now we do acquisitions and enshittification. Buy the competitors and adjacent product makers. Now there’s “growth” again even though nothing new is made, in fact the product gets worse and nobody gets hired as they want attrition to get rid of redundant employees. The hope is that the widget is so engrained in society that it can’t be done without. Now do unbundling. Subscriptions. Sunsetting. Modify the product so that new versions must be bought due to batteries or servers no longer supporting previous versions. If you can’t make new things, make the customer buy new versions of the same old things.
Gotta keep pushing that quarterly report line up to keep the investors happy and the CEO bonuses coming.