[Hjfrf]

I can sell Jack's tweet right now.

That's a bigger issue than Jack being able to sell it multiple times.

[capableweb]

You can. Is it the same? No.

Just as it's not the same if a random person tries to sell movie props from famous movies, compared to if the person actually being in that production in the first place.

[goblin89]

What? If they sell verifiably the same physical prop, then what's the difference?

Jack's tweet doesn't become counterfeit if Hjfrf sells it, it's non-figuratively and verifiably the same exact tweet.

[robjan]

The NFT representing Jack's tweet is a pointer to the tweet. It's possible to create an unlimited number of pointers to the same thing.