It wouldn't make it to production. Multiple design agencies send multiple mockups each to Netflix. Someone at Netflix picks a few that they like and then the or

It wouldn't make it to production. Multiple design agencies send multiple mockups each to Netflix. Someone at Netflix picks a few that they like and then the original design agency has another set of artists ("Finishers") who made the high-res, non-watermarked, final image. The problem is, if your source images have watermarks and the competing design agencies' don't, Netflix is going to pick your mockups for finishing less often because they don't look as good. The market selects for design agencies that don't use images with massive watermarks in their mockups.