Non-Fungible Tokens represent something unique, such as some real life valuable object, asset or service, they have a clear future from every development done, and that's why many people are attracted to NFT, the concept offered is quite different from before, NFT has two things that are quite popular, first the second game is artistic value and this can be traded freely and without restrictions, not even that many rules are offered by the NFT.
NFT is a digital asset like crypto in general and the uniqueness of NFT has a high selling value. if I'm not mistaken the first time I heard of NFT punk on the ERC-20 network with a selling price of millions of dollars. who would have thought that just a piece of digital art could attract investment and increased market cap. The emergence of NFT-based projects has attracted public attention so far, as well as warm welcome from various circles such as artists, music producers etc.
If the market succeeded to get an expanding growth in market cap, this doesn't really mean that it attracted investors. Imagine why should anybody pay thousands of dollars (even millions) for a digital art!? There are two scenarios: One is that somebodies are using this market to wash dirty money (Money Laundering), the Second is someone or a group of people start making fake trades to deceive others who will think that those digital arts are investment opportunities.