> only downloading things they happen to like
The Library of Congress is selective about what it preserves too, as is every museum. No single entity could possibly hope to preserve every film, it takes a community.
> don’t even follow a basic 3-2-1 backup protocol
The swarm is the backup. You can't beat hundreds of hash-checked copies across the globe.
> I bet not even 1 in 1000 people pirating are doing it primarily as a preservation exercise.
I bet you're right. Isn't it wonderful, then, that those 1 in 1000 (who are overrepresented in tracker admin and release group/scene work) are able to harness those selfish impulses and turn them into the most complete, accessible, and durable distributed art preservation project in human history.