These are not NFTs. These are trading cards made by BitcoinTradingCards (npub1yjr…33a9). Learn more about them at their website, https://btc-tc.com
NFTs, or Non-Fungible Tokens, are digital certificates of any form of data, which are linked to a hash that is kept on a blockchain. They are neither rare, nor difficult to copy, which is why the market for NFTs, including the inscriptions on Bitcoin's timechain, is full of rug-pulls, and is quickly dying out.
These trading cards are neither digital, nor easy to copy, and many find them to be quite beautiful, unlike the "Bored Apes" and similar garbage often seen in the NFT market. True, one must trust the creators of these cards to not print more than what they say they will, but this is often an insignificant matter for hobbyist collectors.
Many Bitcoin maximalists enjoy collecting these cards, especially since they contain timeless Bitcoin education on their reverse sides. They are not for everyone, but they make very good rewards for a Geyser campaign.