Remember when NFTs sold for millions of dollars? 95% of the digital collectibles are now probably worthless.::NFTs had a huge bull run two years ago, with billions of dollars per month in trading volume, but now most have crashed to zero, a study found.
No, they can’t. The article you point to mentioned stolen crypto. Crypto can be stolen if someone has the private keys to a wallet.
A block chain is algorithmically verified by members of the network.