Reflexive question from reading the title: Suppose lots of people have been told that you shouldn't start a startup by yourself, and people are inclined to heed that. Some people will disobey this advice. These will disproportionately be people who have strong reasons to believe they'll succeed. If their judgment is at all accurate, then we might well get the result that single-founder startups are generally more successful, even if the single-founder status is always and everywhere mildly detrimental to the business. The question is, did someone mention this possibility?

And it turns out the article doesn't even mention the relative success ratios (i.e. percentage of startups that succeeded out of startups that were started, broken down by founder count), AFAICT. D'oh. I guess it's valuable information that there are a lot of successful single-founder companies. But "data shows" sounds like a lot more than what is shown.