Earlier this week, Roger Schonfeld and I published an analysis of this Springer Nature/ResearchGate pilot: 

We have been impressed with the range of the feedback. From publishers concerned about the negative implications of this syndication model on their business (https://scholarlykitchen.sspnet.org/2019/07/16/diverting-leakage-to-subscription/#comment-83396) to librarians contemplating that this arrangement may violate the terms of license agreements (https://twitter.com/CopyrightLibn/status/1151464829141389312) as well as librarians wondering how usage might be reported to them - it is clear this is a topic of strategic interest.

Syndication is an important and likely continuing development, and we expect to continue to write about this issue. We are eager to hear further feedback and perspectives from the scholarly communications community and welcome further thoughts.

Best, Lisa