I think you have mixed it up; it did not take 2 years to distribute rewards; rewards were sent after bounty; instead it took 2 years to have a tradeable, profitable price for both investors and hodlers in particular. Another peculiar example is the invox bounty; trading at a valuable price today after about 2 years. The blockchain always win.
if the related project takes up to 2 years to distribute the token I think the project failed to promote the launch of the token, in other words the related token still has hope for the next 2 years to be able to reach a predetermined price, but it can be said that teamwork has not been maximized because the team still unable to attract investors for a short time during the prize campaign.