Coinbase's referral program was so easy to hack, you could ask a friend completely uninterested in crypto to buy BTC, it's as easy as any online purchase, rebuy him the BTC and sharing the referral price. In the BTS 2.0 referral program, the service provider cannot possibly lose money by offering primes : even if it doesn't work as planned there are no risks. And the incentives for exchanges to use it seems strong