The second source would appear to be CBA’s partnerships under the Consumer Data Right (which includes Open Banking and Open Telco). It’s offering telco More’s services at a 40% discount to members of Yello as long as they pay with a CBA card. CBA has upped its 25% stake in More from 2021 to 30% today. In that time More's grown from 70,000 customers to 250,000 with 140,000 CBA customers taking up the discounted services.