[bmelton]

No, it's not stealing from Amazon. They offer the referral system as a service to those who wish to refer people. It's a relic of their 'growth-hacking' days. If they thought it was stealing, they'd simply discontinue the service. It's easy to argue that they don't need it anymore.

But, as someone who's looked into the legality of this (I was building something very similar, but with a narrower charity set than the OP's), it is against their terms of service.