Different uses for different folks. I'm coming from the tabletop gaming side of G+, I am not the only one (far from it) wanting something similar to collections and communities. *We like these features*. The platform with these along with robust tools for reporting and blocking, is going to likely see more users. This is especially true among vulnerable populations, who need to be able to curate what they see as well as who they share to.
MeWe attracted a large number of G+ gamers because it had communities and the ability to control who you share with and what you see from others sharing. But the lack of nonpublic posting is a put off for some, and the lack of diversity so far in the gaming community is a put off for others.