yup 100% good analysis - any kind dir. svcs means centralization. havenot dig much in Filecoin - but a combination of IPFS / Filecoin or similar / Nostr relay solution may be so long as coin based very small reward basis is worked out. any total volunteer basis is not scalable eventually if demand quality disk space grows. decentralized solutions dnot need compete with centralized performance basis so long as it works with some delay.  imagine when youtube or amazon is down for whatever reason - slow n reachable IPFS or self-hosted ones may still work outside of outage zone