You have presented a lot of valid points in considering bounty campaigns to join. I just do not agree completely to this one "Before join any bounty campaign, know the managers. He is well reputed or not. Check his past work how they are success. Try to avoid those aren't well reputed and who managed most of scam ICO." Managers cannot control the actions of the founders/developers despite their due diligence in selecting bounties to promote. That statement also drive away hunters from joining campaigns handled by new managers.
Maybe what is meant by OP, for managers who are professionals, they understand the rules of the forum and more experienced to choose ico which is really real, and those who are new managers are less aware of forum rules and as a result the posts about their bounty were deleted by the moderator.
And in my opinion, for bounty hunters not only pay attention to ico there is an indication of fraud or not, But notice how they post their ico promotions on the thread.
I think this is a great read and educating on how to go about bounty hunting and crypto related investment in general, however, I do want to agree with you on your point here
"Managers cannot control the actions of the founders/developers despite their due diligence in selecting bounties to promote. That statement also drives away hunters from joining campaigns handled by new managers"
I think whatever the developers wish to do at the end of the day can't really be controlled by the bounty manager cos if it so happened to an experienced bounty manager, can we say he should no longer be trusted?
secondly, do you think you can elaborate on this
"But notice how they post their ico promotions on the thread" so we can learn from it?