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Web3 has grown synonymous with blockchain. The things I really value in web3 are non-blockchain distributed systems. IPFS, Gun.js, heck, even BitTorrent could be considered web3. Most problems shouldn't be solved with blockchains. Crypto is what makes web3 artificially scarce.

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I don't know about the others, but IPFS uses Filecoin, which is blockchain based.

This is not exact. Filecoin is built on the top of IPFS!

https://filecoin.io/build/

Yes, but IMHO, IPFS without Filecoin doesn't really innovate in any meaningful way over previous CAS/DHT based distributed filesystems (Freenet, Tahoe-LAFS, etc). Filecoin lets IPFS claim that they have at least tried to solve the freeloader problem and incentivized people to actually store strangers' encrypted data long term.

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