I mean stake as a standalone casino is already an established place and from what I see they had their 5th billion bet on their website as well and they are moving much more faster than primedice which has about 29 billion bets I think and they have been around for years. However you have to understand their success is theirs but their establishing themselves on their early days got a little help from being partners with primedice.
They were promoted as the casino version of primedice and than they made a name for themselves. If they said they had no connections at all or they had not connections for real than they would had some troubles on their early days to establish a name for themselves. Right now, they do not need it, they are currently probably the best place without even any connection.