NFTs is not just collectibles though. Yes, that's its main attraction now but a lot more can be achieved with NFTs.
For example, in India - a police station use NFTs to publish cases filed so that no one can change it.
Also, a university here issues degree certificate as NFT so anyone in the world can verify.
Those new use cases are slowly popping off now
But you can change the url that the nft is pointing to right?
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Or more correctly the asset that the nft url is pointing to?
No.
NFTs here are used heavily on Solana, Avalanche, TON. The NFTs are not just a link to a centralized server there.
Compressed NFTs can be upload onchain on Solana. And that's what is done.