Okay so what if you give them the wrong meal and they want money back?
My guess is that if I had no option to do a chargeback, it would have been harder to get a refund then.
There is an asymmetry here because anyone can be a customer but not everyone can be a vendor- that requires a certain level of reputation and upfront investment. So it is more risky for a vendor to scam a customer than the other way around.
Cryptocurrency transactions require high trust in the sense that they cannot be refunded, but they also require low trust in the sense that the vendor cannot possibly steal any more money than what you sign them.
With an open season of friendly / chargeback fraud, customer lies, refund tricks, etc which customers keep doing every day and so on which too many of that and Amazon will ban your account and they should.