It's very hard to know. Personally, I would prefer not to entrust some projects, namely bounty managers. You can follow him from project to project and get your profits.
Let's make it simple mate, I can say most of them there are trusted dont just do campaign without reading their whitepaper, most bounty hounters just do campaign without taking a look at the white paper, so if you just go ahead to do campaign without reading the white paper you stand a chance of falling on fabe ICO's. Do some research from any resource, and spend about 20-30 minutes for that, and usually you'll find what you wanna know about that project mate. Easy right? Good luck.