To Steven Schwartz, the side hustle was a necessity: He wanted rare Nike Kobe 7 Easter shoes, and his parents wouldn't pay for them. Now in their mid-20s, Schwartz and Zoub still work together, along with a third partner named Jack Sharkey. They're the co-founders of Whop, a tech marketplace that's like "Etsy for software products," Schwartz says. (Whop reviewed the estimate, but declined to offer specifics.) But Whop wasn't an overnight success.

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Persons: Steven Schwartz, Cameron Zoub, Schwartz, Zoub, Jack Sharkey, They're, Whop, Peter Thiel, James Harden Organizations: Nike Kobe, Whop, CNBC