Is it worth starting a company in college?
forbes.com
forbes.com
But that isn't to say it's not worth it. It depends on the founder, the idea, the market, the funding, the timing, and more.
This is not a simple 'sure, because look at these billionaires!' question.
To draw an analogy, averaging the value of those companies between all the companies started is like saying "Onion2k and Usain Bolt ran 100m, and on average Onion2k ran it in 15s!" That doesn't mean I did, and it wouldn't mean I qualify for the World Athletics Championship.