I think the main driver is a lot more simple than other people have said: when you don’t need that efficiency you can focus on resilience instead. As the pandemic showed with JIT supply chains, efficiency and resilience are often at odds. And the bigger you are the more resilience you want to protect your core business and let you just turn the fly wheel that’s making you profitable. That’s also why you see companies start to engage in monopolistic and anticompetitive practices - now that they have the weight they can waste resources on protecting their business instead of just growing it by being more efficient.
This is 100% bad from a country/market level but is what you get when you let local optimizations trump capitalism. In some sense that local optimization also isn’t bad - it’s not uncommon that that behavior is also what lets efficiencies be extracted.
In other words, in many ways all of this is inevitable behavior as things grow and a lot of it are themselves (perhaps inevitable) symptoms of the mechanics at play rather than the mechanics themselves.
In other words, once “founder mode” is documented, you’ll have everyone claiming they’re doing founder mode same as how everyone says they’re now doing agile or whatever other fad you want to pick and you’ll be back at square one until someone then invents “strategic founder mode” or “growth founder mode” and claims to have figured out how you can spot that vs what everyone is just pretending to do right now.