A bootstrapped startup that you stop paying attention to will rapidly stop making money.
For some, sure. For many others it's to have the freedom to do something they enjoy, or to solve a pain they've encountered, or to help others. YC funds plenty of non-profits that aren't likely to ever make the founders "fuck you money" rich. In fact, most of the founders of those startups could earn much more elsewhere.
Yup! Then try hitting the wall at 600 mph, after raising $100M. That ain't pretty either.
The analysis in the article doesn't normalize for the frequency of a certain founder-number bucket. What if 99% of all start-ups have single founders? Then of course most of the companies that exit have a single founder, even if single founders perform much worse.
You can kinda extrapolate the ratio of successful startups / total startups for each founder buckets by looking at the y-axis counts...but in that case, the ratio of successful startups given the startup raised $10M is 80%-90%, which doesn't make any sense. Is this data correct or am I misinterpreting it?