Are you sure most people who use wmp in 2021 aren't just using it to watch the downloaded movie/show/etc?
Serious question, because most people just do media in their browser or iTunes (or equivalent from various streaming services) at this point.
Is VLC a piracy tool? What about mpv?
I suspect you are deciding what a tool is for and then deciding the motivations of that tool's users based on what you decided the tool is for.
Compare: The vast majority of lockpick owners just think it's a fun skill. They never use the picks other than on locks that are explicitly purchased for picking (locks they or a friend own, usually not actually locking anything, etc). Yet when traveling to (e.g. defcon) places where they will be socially lockpicking with other enthusiasts, the TSA often harasses people for being theives. It's happened to me and plenty of others because folks decide the intent based on the tool.