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Well, there was the reason: disallowed keywords, not lack of sales.
Different incidents. First, the Amazon Associates Program Operating Agreement changed effective October 1, 2021.
This is part of the new Operating agreement.
To comply with Federal Trade Commission (FTC) regulations, your link-level disclosure must be:
1. Clear. A clear disclosure could be as simple as “(paid link)”, “#ad” or “#CommissionsEarned”.
2. Conspicuous. It should be placed near any associate link or product review in a location that customers will notice easily. They shouldn’t have to hunt for it.
In addition, the Operating Agreement requires that the following statement clearly and conspicuously appears on your Site: “As an Amazon Associate I earn from qualifying purchases.” For social media user-generated content, this statement must be associated with your account.
Here is the text from the email, April 2019, when they threatened to close my account.
Hello ********,
We are reaching out to you because you have not reached the required Qualifying Purchases for your account. As a reminder, Associate accounts that have not referred three Qualifying Purchases to Amazon.com within 180 days of sign-up will be closed.
There are many ways to increase referrals and advertising fees you earn through the Associates Program, including:
• Making your existing links more prominent or visible to site visitors
• Including links to additional products or product variants
• Adding links for trending promotions that you can find in our promotions hub
• Increasing traffic to your website using search engine optimization and social media
R.C.