timppu: I think that is a crime in most developed countries. Nice going buddy.
Overall, I think people who don't want to use the service should just leave. You are making yourselves look like idiots, that's all. Like some butthurt ex-boy/girlfriend who lost their mind after a breakup.
Giving (negative) feedback for issues on the service is one thing. Being an asshat is another. Then there is also a third thing but I am not going to tell you what it is, it is a secret.
EDIT: Maybe it would be just better if GOG closed the forum. Many other stores don't have a forum either, e.g. I don't recall Humble Bundle having one, not sure if Epic has either (at least through their client). The forum is just a free extra service that GOG is offering, they have no obligation to keep offering it.
Here, have a linden tea. Then, keep chasing your inexistant ghosts somewhere else --buddy--...