This particular NFT set was created on crypto. com's own mainnet (which, much like Binance, just created their own vastly cheaper mainnet), so unlike most NFTs, it wasn't minted on ETH. The minting costs were essentially nothing and done with crypto. com's own resources.Sheeeeit, any idea of what the minting cost might been? or once you make a NFT for a piece selling 1000 of them has not extra cost?
I'm not an expert on NFTs, but you can read up on them here: https://eips.ethereum.org/EIPS/eip-721.
There is also a newer kind of semi-NFTs called ERC1155, which seem to be used in gaming:
Anyway, yes, once they are individually minted with gas fees from $2-$35 per NFT (depending on the day) they become non-fungible, so if you wanted 1000/1000 copies of a F1 NFT, you'd have to buy each one separately.