I think this statement like you said is a method of choosing a project with a bounty, most of the bounty hunters in this forum are really happy to follow a project managed by an experienced manager. because there are not many frauds when managed by great managers.
It's not a lot of fraud, but managers who are experienced in managing bounty campaigns have checked it first and also have direct communication with the team before posting bounty campaigns on this forum, that's why experienced managers often find good projects so it doesn't make the bounty campaign participants were deceived.
Yes, it is true. and not all bounty managers are careful with it, only a few managers understand that and don't want the bounty participants they manage to be fooled.