This isn't just risk aversion, it's really that the tiny changce of being a billionaire doesn't really appeal to me more than a solid chance of just building a business and having a healthy work/life balance the whole way.
Nothing to be about "startups" means you have to have things that "scale" or hope for exponential growth or being able to sell the company, or even some new or impressive tech. To me it literally means "a young company bootstrapped with a small amount of cash, hoping to grow".
E.g. wikipedia
"startups refer to new businesses that intend to grow large beyond the solo founder"
I don't mind that definition. But I also wouldn't call my company not a startup if it doesn't want VC funding or doesn't hope to grow more than linearly/organically.