Even everything above is followed correctly, still there's no guarantee that project will be good. However, if someone does enough research it's possible to avoid scam project. I am really bored on bounty and given up participating too.
There is absolutely nothing that can guarantee what the outcome of any bounty could be, even when the tasks are limited, with stakes counted promptly, it's still isn't enough of an indication that the bounty would end, but when bounties by certain managers, you can be rest assured that there is a better possibility of it being successful (or at least) pay it's participants.
That is exactly the point. So far as this forum remains a decentralized platform, bounty scams will always exist. The only solution to this bounty is when bounty projects are made to pay bounty hunters in already trading crypto coin like ethereum or Bitcoin with a fixed rate per a particular campaign. If not, bounty scam will always exist here.