For me personally. I consider bounty campaign as a greats passive income. I joined some good campaign and i get some good payout although there are also campaigns that do not pay.
How will these bounties be a passive income? do you have income regularly? passive income means stable income for a period of time ,i wont consider it as passive income because for me mining is the only passive income in cryptocurrencies,it will be waste of time if you are going to participate bounties from time to time but you wont get paid.