What is with capitalism's obsession with constant growth? Buffer is a great app, I use it every day, but how in the f*ck do they need 100 employees to maintain

What is with capitalism's obsession with constant growth? Buffer is a great app, I use it every day, but how in the f*ck do they need 100 employees to maintain it? My company is writing an entire smartwatch OS, including companion apps for iOS and Android, and we're less than 10 people. Buffer needs 100 people just to write one multiplatform app? What is going on here?