While I agree that piracy can be preservation of media, it’s most often not the case.
Streaming torrents directly or through real-debrid doesn’t help preserve media at all. Leeching only without keeping torrents alive also doesn’t keep media accessible.
Some people might store media for a few decades and then reupload, but most people never create new torrents.
I’d say the pirates who help preserve media are a small subset of pirates.