Why is this, and all my pictures rejected for "quality issues?

Does Adobe still keep the pics for AL learning even if they are rejected?

By @Soliduskal001

No, they have enough error free assets to train their AI. 

You will need to enhance (edit) the assets in Lightroom. You need especially to reduce the noise: 

You have strong chromatic noise.

A picture like this does never get sharp enough at 1/25 of a second and ISO 1600. And for that setting it is astonishingly sharp. The focus, however is on the nose, not the eyes, as would be required.

As @daniellei4510 said, the ears are clipped and need to be repaired. The background also needs to be a little less distracting. To get assets approved, they need to be exceptional. They need to be exposed properly and they need to be sharp. As an idea, I altered your photo by repairing the cropping, adjusting the lighting, blurring the background, repaired the ears and sharpened the subject.

I've recently started uploading again after ~5 month absence. Before, my images were waiting a couple of months for review and now rejections are coming in in less than 6 hours. Also had a similar content rejection on a completely unique image. 
Clearly they have started using some dodgy AI software to review at least some of the images, which is a real shame - I didnt mind the wait times once I knew at least a human was reviewing my pictures 

Does Adobe still keep the pics for AI learning even if they are rejected?

By @Soliduskal001

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No.

Rejected images are deleted.

The preview photos you see in your panel are for your reference only.

A high rejection rate usually means you haven't done your homework. Compare your work with current Stock inventory. As you can see, Stock has millions & millions of cat images.  To be accepted, yours needs to be unique, funny or exceptional in some way.

https://stock.adobe.com/search?k=cat

Customers expect the highest visual and technical quality for use in commercial projects.

• 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/how-to/tips-stock-image-acceptance.html

Hope that helps.

I agree with @daniellei4510  that this one shoud have been rejected.

Many Contributors are reporting increased rejection rates, either for quality issues or similars. Adobe has apparently changed the reviewing processes, resulting in many unjustified rejections. I can't get anything accepted lately, so have decided to stop uploading new content for now until this is resolved. 

Cropping is the issue here. The cat's ears were clipped. That said, there are 8.5 million images of cats available in the database, so the competition is saturated. Only representative thumbnails of rejected assets are left and doubtfully not used to train AI. The last thing AI needs is to be trained on assets with quality issues.