I know permissionless means you can run the code and connect your node without asking permission.

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Also means you can contribute to the code without permission

That's more complicated but yeah.

In this point of view most github development is also

The PRs must be accepted so no

Exactly. This is why Bitcoin is a public blockchain - as well as many others. So Bitcoin is not the only one, and this is bad news for bitcoin-only fans

Bitcoin has other attributes that make it unique.

But yes, a lot of blockchains could be permissionless