It was really good 15 years ago, but in those 15 years (and I'd say especially the last 5 or so) the community has become more hostile to new contributions. Once I've been told a few times my contribution is not wanted, I stop participating in that community (assuming that on reflection I'm not being an asshole).

In a significant way, that's probably due to how incredibly toxic the managing company has become. An aim for profit eventually ruins everything, including what used to be one of the best knowledge sharing sites around.