The problem i see with forums of the casinos is pretty simple, you feel like you can talk only about what they want you to talk, and is not so free of speech like here, i dont know how they manage people with complaints there.
So i dont think they can grow much bigger than a forum like this one.
You are absolutely right and I completely agree with you, I personally have at a time tried to stay active on Stake forum after signing up but to be honest, I couldn't find it as interesting as this forum is, and this has nothing to do with this forum's allowing users to wear ad signatures and make some money with it, because I could manage to stay active there and here too, but unfortunately, I didn't feel the same level of freedom I feel here over there, so, after some weeks, I found myself reluctant to even visit there until I stopped visiting completely.
Casinos forums can never be as good as Bitcointalk, and I dont even see any need of them creating forums when they already have their presences here, and as well as their social media accounts to connect with their users.