I am whole heartedly for a tool to audit whether others are complying with your licensing terms. Attributor just seems like 100% a good thing. I have no misgivings at all.
Ultimately this should be a really good thing for those of us who want to occupy the middle ground, because it empowers rights holders to take responsibility for letting people know when they have a problem. As it stands sites like grabb.it, Webjay, YouTube, etc are supposed to magically guess what the rights holders wanted.