For those that don’t sell FBA on Amazon and have a hard time relating to this, imagine you lived in the old country and the local Poritz had some displeasure toward you. To teach you a lesson he forced you to stand outside your home while he announced in the town square that one and all can come and help themselves to anything in your home for the next hour. You are watching, powerless as bedding, jewelry, pots and pans, precious heirlooms, and all your memories are being carted off by the exultant crowds one by one. Your neighbors are all reaching out to their friends and relatives to share the news of the amazing bargain to be had. How would you feel watching the gleeful masses descending upon your home? Sometimes these price mistakes can be very similar.
Not a perfect analogy. There are rules in this old country that are not displeasure toward you but rather rules that apply to everyone. In this county once you advertise something to the public there is no taking it back. You went along and listed that you have a couch to giveaway and instead or writing couch you wrote house (now this county also has safety nets in place, (on FBA called MIN/MAX price) and before you post your ad you can make sure that if something gets listed incorrectly it shouldnt post.
Now, in no way am i saying that this doesn't sting and hurt and its a mistake that can take a lifetime to recover from. But to make it sound like Amazon target him is not the full picture.
Back to the ethics part, from my few years on here, 99% on price mistakes are sold by the Poritz themselves and they do hold the power to cancel the order. 3rd party seller mistakes are far and few in between on Amazon and on peoples own websites they have full control and do cancel orders all the time.
Take Revel as an example i think they handled it well, let the credits stay active for a period of time and acquire the customers. (uber/Uber eats has given me way more the $400 over the last few years)