Twitter’s cryptocurrency community presents a mostly united front against all challenges. But Jack Dorsey, a founder of Twitter and Square and a Bitcoin evangelist, just exposed a deep internal rift over the direction of crypto and pitted himself against some of the industry’s deepest-pocketed backers, the DealBook newsletter reports.

The fight is over Web3, the industry name for a blockchain-based internet that runs on crypto tokens. Supporters say it will democratize and decentralize commerce, finance, gaming and more. But Mr. Dorsey warned that Web3 was really owned by the venture capitalists who are pouring billions into cryptoventures: “It will never escape their incentives,” he tweeted.

Others echo Mr. Dorsey’s concerns. Charles Hoskinson, who co-founded the Ethereum platform, told DealBook that heavy venture involvement in an ostensibly decentralized ecosystem is problematic, since they have ways of potentially taking outsized control of projects. Elon Musk cheekily tweeted, “Has anyone seen web3? I can’t find it” — to which Mr. Dorsey replied, “It’s somewhere between a and z,” a seeming dig at the venture firm Andreessen Horowitz, widely known in Silicon Valley as A16Z.

Andreessen has heavily promoted Web3 in recent months and invested billions in related projects like decentralized autonomous organizations, or DAOs. These entities are governed by users who vote with tokens. A16Z has argued in policy discussions with government officials…