Hi jackpotcasinoguide,
Well I thought (and have confirmed this with my affiliate manager at Referback) that at least some do… and ReferBack is one of those…
At ReferBack a new player is linked to you at customer level. What this means is that you receive the credit for the player across all brands and accounts.
I’m not sure on others I’m afraid.
Cheers,
Geno/CC