Hiring, firing, layoffs, making the wrong decisions with limited information and not finding out they were wrong until years later, huge shifts in the tech market around you undermining your business, competitor actions wrecking your business, pressure from investors, pressure from your family to earn more money, uncertainty about whether the business will ever succeed, and an endless list of other things.

> You don’t lose any money if your startup fails.

Except all the money you lost by not having a proper job along the way. Also it’s not uncommon for founders to float the company at early stage until investment is raised, and they don’t always get a refund for this.