You answers my questions. That's exactly what I read before. Gridcoin isn't fully trustless at this point. Nonetheless it is working at this point and doing some good but because it isn't fully trustless it cannot expect to do what a trustless crypto can do.
I wonder if EOS could help making an idea like Gridcoin to become trustless.
EOS is very interesting, much like all the Graphene based systems we have today. But it would not help Gridcoin become more trustless in the fact that it still needs to rely on the BOINC projects statistics that they generate and base the rewards thereafter.
But as @dutch points out, this is the reason the community votes on new projects and that not all projects are just automatically included.
The network itself is secured enough with the basic PoS system that it is built upon.