The reputation of the manager can't be a good factor to determine how trusted the project. Sometimes the good bounty managers can also get a crap project or even scam project. It's better for the newbies to keep focusing into the reputation of project.
You are right, even we can see a lot of big managers like Artezy and wapinter also holding too many project scams. A manager is an ordinary person who makes money like a bounty hunter. who pays them will be done. no matter they will scam or not.