Hi Alex,
Kindly go through https://www.adobe.com/content/dam/acom/en/legal/servicetou/Adobe_Stock_Terms-en_US-20170630_2200.pdf to know about the licensing terms and restrictions.
Also, I would like to let you know that with Extended licenses you can use the asset in email marketing, mobile advertising, social media, or a broadcast program. Assets may also be featured on merchandise or products for resale, however, the ownership of the image is non-transferable, hence one cannot use the image to create or publish anything in their own brand. Even if selling the images in form of t-shirts or any other customizable items with the brand name of the shop is not permissible as it removes the rights of Adobe Stock and hence a conflict.
You may also refer to Common Questions, Adobe Stock for more details.
Hope this information helps!
Feel free to update this thread in case of any additional questions.
Regards
Twarita