Because they haven't heard of nostr yet.
Discussion
Nostr doesn't decentralize large media storage or stop link rot. I hope blossom can though....
What if nostr users, with extra space, could offer private large media storage to other nostr users for × amout of sats, similar to how relays work?
Yes. I'm looking at blossom repo and thinking about how to implement sats for note storage on a relay implementation I'm working on right now.