After one year, when your business is (presumably) up and running, you start repaying investors out of the revenue pool until they've earned back 2x on their investment. (inc.com)
In the event that funds are lost permanently, the exchange may be held liable for repaying investors the funds that disappeared. (disruptordaily.com)
Usually a stock buyback program is a way to repay investors with cash currently sitting in the bank. (recode.net)