That's true. Vitalik calls this the 'Social Layer' of Blockchains.

I'm not one to call crypto protocols immutable, so I'm sort of with you. That's why I added 'practically' and 'easily' to that sentence.

Not even China was able to ban a decentralised chain. So I'm cautiously optimistic...

-- Edit --

Hadn't seen your first and third points.

1) & 3): Agree with your points. I'd just add that you don't have to speculate to use these networks for real day to day transactions. Also, i'm not bullish on incumbents innovating faster than these permissionless protocols.