I don't think there is a need to set up an internal forum as they have an active chat specific for players of the games' interests the Telegram groups and channels are all enough for the players and the admins to interact and get all the latest updates.
They also reward the most active chatters in their chat they have 5 channels on Telegram and it serves the members' needs when it comes to communication.
The telegram group shows good activity; it is good to see that they have admins and mods in the group who are active.
They have to do this, this is a gambling channel they need to upload giveaways and announce new events to keep the interest of the players and so far Hunnyplay is one of the most active channels I've seen I am a member of 7 gambling channels but on Hunnyplay's main chats, there's always new events and giveaways almost every hour.
We can say that the platform has active players that keep the platform busy.
You are right, I am also a member in their group on telegram and also a subscriber to their channel, though it's with my Alt telegram account, and so far, I hardly participate in the chat but I do often visit there, and it's just as you have said it, it one of the most active casino group I am part of, and the secret there is so obvious that it's no longer a secret.
And that is the giveaways just as you mentioned, a lot of people on the internet today love free things, free money, free bet, free spin, free whatever.
So, it's no surprise why the telegram group of this casino is always very active, this is something I believe that other casinos with a dead telegram community can emulate to bring vitality again to their group.