According to Adobe, the NanoBana 2 Pro produces images of unacceptable quality.

Adobe never said anything about 3rd party NanoBanana 2.

1. Stock reviews all assets for sales potential. 
2. When assets meet acceptance standards, they're accepted into inventory. When they don't, they're rejected. Simple, simple.
3. This has nothing to do with which tools Contributors decide to use.

Read your Contributor User Guide for more details.

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/contributor/help/how-to-submit-distinct-content.html
• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html
• https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html
  
  

Hope that helps.