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That depends. Part of the appeal of blockchain is that it stores a record of each time a transaction occurs, making it harder to steal and flip than, state, a painting hanging in a museum. That said, cryptocurrencies have actually been stolen prior to, so it truly would depend on how the NFT is being stored and just how much work a possible victim would want to put in to get their stuff back.
Most likely. Bit rot is a real thing: image quality degrades, file formats can't be opened anymore, websites decrease, individuals forget the password to their wallets. But physical art in museums is likewise shockingly vulnerable. Yes. Probably. A great deal of the markets accept Ethereum. However technically, anyone can sell an NFT, and they might request whatever currency they want.
Given that NFTs use the exact same blockchain innovation as some energy-hungry cryptocurrencies, they also end up utilizing a great deal of electricity. There are More Details working on mitigating this issue, but so far, the majority of NFTs are still tied to cryptocurrencies that produce a great deal of greenhouse gas emissions. There have actually been a couple of cases where artists have decided to not sell NFTs or to cancel future drops after becoming aware of the results they could have on climate modification.
Well, like cryptocurrencies, NFTs are saved in digital wallets (though it is worth noting that the wallet does particularly have to be NFT-compatible). You could constantly put the wallet on a computer in an underground bunker, however. Believe it or not, you have choices! Steve Aoki is working on a program based on a character from a previous NFT drop, called Rule X.