Now cryptocurrency is actively used in different spheres. The ways of use of cryptocurrency increase with even every day. For example, now NFT are actively used for charity and for different philantropic perposes. Just example like NFT and cryptocurrency can used -
https://twitter.com/impactwomen_nft/status/1507444356386545669Many famous persons create and develop NFT. They are actively promotion NFT collections that is why NFT so popular and in demand.
For every NFT collection promotion is necessary.
The price of NFT depends from demand in it. A lot depends of popularity of NFT and who created it.
Now NFT allows to earn even more money than other tokens and altcoins. That is why they are so popular and in demand.