Web3 is irrelevant. Actual Web 3.0 isn't anything blockchain based. Web 3.0 is the total corporate take-over of the entire web by Google/MS/Apple requiring CA based TLS in the HTTP/3 (QUIC) implementations in their browsers.
It's kind of crazy to think that smartphones' inability to hold open a TCP connection (and thus the desire for UDP) are managing to ruin the entire (non-commercial) web.
Obviously.
There are also DAGs (IPFS), hashgraphs (Hedera, IOTA), blockweaves (Arweave), and probabl many more alternatives to blockchains to power DApps.