Because as a founder the startup is your life. It exhausts you mentally, physically, emotionally, financially. If your startup isn't accelerating, it feels like you are wasting your life away at an accelerating pace.
Is the same true for someone that opens a restaurant or tire store?
No. Apples and oranges. I presume the guy running the local AutoZone doesn't aspire to be acquired by Google or Roche for $2 billion. You could make the case for expert chefs or restaurateurs pursuing Michelin stars and fame -- going through relatable struggles, aspiring global success.