That was my guess too, but this one actually isn't. Amazon uses "?ref" for reference (innocuous), and "?tag" for affiliates. For quick reference, a.co and amz

That was my guess too, but this one actually isn't. Amazon uses "?ref" for reference (innocuous), and "?tag" for affiliates. For quick reference, a.co and amzn.com are official shorteners and considered safe. amzn.to links however are third-party and often used to conceal affiliate links.