It's a good advice considering the scams around the crypto space.
With good bounty manager, you can expect that they will choose a legitimate project to promote.
You can trust them to do the research so it's vital that you look also on who will manage the project.
Now, who are good bounty managers?
That remains to us if whom we will trust but I suggest that we do select those who are trusted in the community, especially when trusted by DT or would be better if it's part of the DT. There are a lot of bounty managers right now but not all of them can be trusted, just like the ICO, you can't trust all.