Evangelists of the stuff will tell you that you can own your own digital corner of the information highway (Second Life came out in 2003, and most MMOs have housing), or that you can trade rare items with your fellow players (TF2 and Counter-Strike have been doing this forever). Then there's this idea that you "own the item" in question more than you would otherwise (you don't, you own a certificate that's associated with it, and the item will vanish if the infrastructure does). Then there's the whole "you could use a sword from one game in another game!" nonsense, which I think we can all agree was cooked up by people who don't understand how game design works on even a fundamental level.

This is so on point for the web3 space, and parts of the AI space too.

Evangelists waltz in and berate you for not understanding how gloriously awesome their system is... without even making a cursory effort to check if it already exists, much less accumulate a deep understanding and appreciation like they expect you to do.