Tracking dissemination of open access publications
I think this is only a concern if you believe that people choose what to read based on how "popular" it is in terms of reads on sites such as ResearchGate. I really hope that this is not the case.... so long as it's citations that you are tracking (which is itself a flawed metric, but less so, and is one that is commonly used), then it doesn't matter where the paper is hosted - what matters is keeping it as accessible as possible.