Some of these rules will be followed, but it will surprise you the bounty will turn out to be scam. But there are some red flags that you should avoid, like if the bounty manager says he or she doesn't hear from the team members.
When the bounty manager says he doesn't hear anything from the team behind the project it's already too late, team is gone with all the money they collected in private sales. I think the only way to be protected from bounty scams is to make a good research about the project and the team, and if you see anything suspicious just turn around and run away!
I had luck with past few bounties I participated in, I hope that I will be satisfied with this one too, everything looks fine until now.