Breja: I just got a "bell" notification from the Dreamlist reading "Doom is now on GOG! Your contribution helped to bring it back - grab it now". Great... but I already bought it days ago. And of course it doesn't go away on it's own even if you click on it, have to use "clear all" to get rid of it.
dnovraD: I also got a neat one. Someone shared a story on Catz, which is nice and all, but piffle beheld before my interest.
It should be possible to turn those off: there's a section in
https://www.gog.com/en/account/settings/subscriptions and everything's active by default.
I think the 'Game you voted on is now available on GOG!' one may be newer than the others, since it turns out I'm still opted in. Or maybe I thought they'd be timelier.