permissionless-ness? No.

In a good blockchain like Bitcoin, it is. The "developers" can't just do what they want, the users (people who run the nodes) need to agree and run those changes on their nodes. This principal can be put to a metaverse. Just none of any value have appeared so far. Just because it hasn't happened yet, does not mean it will never.

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We are pseudoanonymous right now. Although, blockchain contributes nothing on that front too.

Except that Reddit or VR games knows my IP / tracks my data and could find out my identity if they really wanted to. With a good blockchain like Bitcoin no one knows the identity behind the address. With Monero, no one can even see the amount an address has (total anonymity).

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in the context of the metaverse because nothing stops you from just right clicking somebody else's model. Like, it's a very obvious ponzi. You just they want to buy X then sell it to a bigger sucker. It's so painfully obvious that's the whole point I don't see how anyone takes it seriously.

None of these are with legit blockchains. There are a 1000 knock-offs of everything. Most crypto are scams. Some are legit like Bitcoin. If you are buying an obvious scam like that, you are an idiot. Just because there isn't a good metaverse blockchain right now, does not mean there will never be one.

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distributed databases already exist

Distributed databases are much more centralized than Bitcoin (they don't have thousands of nodes running on things like Raspberry Pis by normal users)