> A digital ID, a in-game asset, a digital license, a ENS name, etc…

These are literally things tied to off-chain assets. Your "ownership" of any of those things only matters if someone else cares about the particular block chain it lives on.

If you "own" a game asset on blockchain A and I only care about blockchain B, as far as I'm concerned you don't "own" anything.

There's nothing stopping anyone from starting yet another blockchain and reselling all NFTs on that new chain.

Besides, unless a URL a token "owns" lives on the blockchain it literally points to some off-chain resource. If that URL in any way becomes inaccessible the thing you "own" is meaningless.