It is ethnically wrong to impersonate authorship and Research Gate is not intelligent enough to find wrong authorship. May be RG follows ORCID like unique ID to resolve impersonation in authorship.
ResearchGate is not a pathway to authenticating authorship on any article in my experience. I am often repeatedly contacted to state whether or not an author actually wrote an article with which I have no connection what so ever and don't know how my name ended up on a list to authenticate the authorship.
When I have been contacted regarding an article with which I have been involved and respond as to the legitimacy the co-authors listed, I have continued to be contacted regarding the same article, indicating to me that ResearchGate does not actually make note of responses. Moreover, if I responding to these requests seems to trigger being constantly asked to testify to the legitimacy of the authorship of any and all articles published by former co-authors whether or not I am involved in any the articles related to the inquiry.
I no longer answer ResearchGate's requests, but would if I detected false authorship on an article I wrote in the hope someone out there will make a note of it.,