Rug pull scams "pumping up" a new project, nonfungible token (NFT) or coin to get funding. After the scammers get the money, they disappear with it. The coding for these investments prevents people from selling the bitcoin after purchase, so investors are left with a valueless investment.
If I may know, what project are you referring to, so that we can avoid such scams, if you mean selling NFT through Airdrop claims it looks like you need to see the partners and the project before investing, I have several NFTs and from those NFTs I can stake and play games.