It's a private transaction, so it's unknown and unless it's leaked out we are unlikely to ever know. There was a startup I was co-founder of at one point, and seven years later (about the same age as Paperspace) we sold for a similar amount, and the net of my shares was a little over $100,000. The CEO got more, other early joiners less. And among my direct knowledge of individuals in the startup community, this is not an unusual case, but rather typical. Many times companies are sold but the money goes primarily to the venture capitalists. Even seed and early round investors can get minimal or no returns after later dilution after a sale.
The "20%" case is typically the best case that happens only in the 1/10,000 chance of extreme fast growth into a new behemoth, OR where the founders are already high net worth individuals or come from high net worth families, and can provide their own money in conjunction with VCs instead of relying on them for most capital.
Because this is all private and not discussed, we tend to only hear of the very exceptional cases, and ignore the vast majority of the non-lottery winners in the startup world.
