They also change their thumbnails based on whatever their algorithms think you want to see.
If I log into my account and someone else logs into theirs side by side we'll see different main characters featured in the thumbnail. (Like "attractive female lead" for a male user, "attractice male lead" for a female user. At the very least. Usually its much more insidious. During the height of the woke resurgence a few years ago all the thumbnails were looking very "equitable-representation-y")