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.
It seems that fraud is so rampant everywhere that they always justify any means to do it, like what you say here. Therefore, never believe in new projects that come and provide very attractive offers for everyone. So before investing you have to really do some research first so you don't get caught in the traps made by these scammers.