The only thing I can say is that I'm a lot more likely to be active in a place where I can talk about my own stuff without fear of alienating people. I don't really know how to create an atmosphere that makes people feel safe to talk about the stuff they're putting so much of themselves into, but I do think being able to mention your work guilt-free is important as I think it'll encourage people to participate in more parts of the forum rather than just having a devlog thread for their games they update without going anywhere else.
Holy run-on sentence, Batman!