I have a friend thats working with a webshop ie, (Prestashop) syncing all its stock with ebay and eventually all its products, description, title, price, it totally looks like duplicate content. What would be the best suggestion for this ? Should i ask him to rewrite new content for ebay for more than 5k articles / 300 words each ? Maybe change the content to an image with text in it ? Are there any other alternatives i havent thought of ? Does google penalize if the same content is in different marketplaces (amazon, rakuten, ebay... )?