Most of the old casino rarely come back to market here. It seems to me that once they hit a certain target number of users, they relax and stop pushing too much bonus promotions in the forum alongside the signature campaigns
Back then, Cloudbet would have so many bonus promotions, contents and other giveaways in games and rounds
They can leave after achieving success and good customer base for their business but they can return here like Bistler team recently said in their announcement thread that their team are considering some possible marketing in the forum after leaving some years ago.
Some casinos have their own forums like Stake, Primedice and others but if they want to advertise their business, they have to do this outside their own forums. Their own forums are only places to build up bond and loyalty of their users, not best places to advertise and find new customers.
Cloudbet as you knew, has signature campaigns with Hhampuz, then stop these campaigns and marketing many months, before they do it again with icopress, then stop it again.
We don't know will they return with campaigns in future but they possibly will do it again.