I already answered both questions: first, it is not true, that "nothing will stop" it. And second, I already shared a link, describing what could happen, if people will abuse the chain too much: https://delvingbitcoin.org/t/dust-expiry-clean-the-utxo-set-from-spam/1707

See? Here and now, every node have to process the whole UTXO set. But, things can be changed in future versions, and node operators can decide, that they don't want to store everything. Today, we have full archival nodes, and pruned nodes. Currently, you can bring around 600 GB of historical data into something like 10 GB of the UTXO set.

However, if there will be more and more spam, then the UTXO set can grow much faster than today. It can take 20 GB, 30 GB, and so on, and so forth, until reaching the point, where the size of historical data will be comparable with the size of the UTXO set, and then, pruning won't do anything good anymore, and will only block you from bringing new nodes to the network.

And then, node operators can decide to implement proposals like linked above, which would allow them to process the subset of the UTXO set, and stay compatible with the rest of the network. Which means, that if there will be too much spam, then it is possible, that it will make enough developers angry, to implement solutions, which will keep spammers away from money-based transactions.

For example: imagine that today, you can visit some block explorer, and it will show you some on-chain posted image. But if there will be too much spam, then imagine that future version could require users to store their own images locally instead, because new nodes could refuse to store non-consensus-related data at all, or even store any historical data at all, and require all users, who will want to move their coins, to provide more data during spending.

And then, if exploring the full history won't be that easy, as it is today, and if everyone will be forced to keep those things locally, or else such coins will be unspendable, then it will stop a lot of people from spamming, and only the most persistent ones will keep doing that. If people will find out, that Bitcoin is not a cloud storage, and you simply cannot be a leecher in this P2P network anymore, then old NFTs will simply behave like old torrents with no seeders.

So, the question is: do you want to push Bitcoin in that direction? Because if someone is pro-NFT, then that person should be aware, what could be a consequence of using Bitcoin for every blockchain-related thing, instead of focusing on payments. Simply, non-monetary use cases can be punished in the future, and then, the whole monetary activity can be moved into some subnetwork, while leaving mainchain people with a spammed chain, which is not used to move any coins anymore.