I get that people don't know, but by the same token, people don't read the help and think that they are doing things correctly.
Not having a go at you, but from the help:

Display items in an uncluttered space against a neutral backdrop

Do not add graphics to images such as badges, logos, copyright notices or watermarks as they can affect your listing's placement in search results

https://www.ebay.co.uk/help/selling/listings/adding-pictures-listings?id=4148&from=EBAY_AI&origin=EB...