Amazon.com is nothing but a sales site so I cannot imagine why anyone would think it is anything other than a path to try to route around in-app purchases, same

Amazon.com is nothing but a sales site so I cannot imagine why anyone would think it is anything other than a path to try to route around in-app purchases, same with Bandcamp. The one with the developer blog and a patreon link is a lot weaker, but the other two examples were explicity not allowed according to the rules at the time.