All a NAS is is a separation of concerns, if you build a system who’s only job is to provide networked storage, then that system is a NAS. If you buy an off the shelf “NAS” and proceed to run a bunch of services on it, that is a home server, not a NAS. Build your own NAS and most of your concerns go away.
Just like pretty much all media ever really. It’s not like many novels, songs, movies and TV shows are world wide hits either.