You can technically target competitor brand keywords like “Dell mouse” in your advertising campaigns on Amazon (e.g., in Sponsored Products or Sponsored Brands), and it’s a common strategy for competitive positioning. However, while this tactic may bring impressions or even clicks, conversion rates are usually lower because customers searching for a specific brand may not be interested in alternatives. As for compliance, Amazon permits bidding on competitor brand keywords in ads as long as you don’t use those brand names in your listing title, bullets, or images—doing so could lead to policy violations or IP complaints. So yes, it’s allowed in campaigns, but should be used carefully and strategically.