Optimistically, NFTs give artists and photographers a new channel to sell their work without being constrained too much by middle men. As an example, photographers often try to monetize using stock agencies, whom fully dictate terms and give them pennies, whilst keeping most of the resell value themselves.
As such, NFTs offer less gatekeepers, less or no cut on revenue, as well as new technical possibilities. The artist has far more control, and thus economic freedom. At least potentially.
As to whether this actually leads to artists more successfully monetizing is another question entirely. Too soon to tell.
This is a benefit of cryptocurrencies in general, but doesn't explain specifically how NFTs themselves (rather than a generic selling platform not utilizing NFT tokens) increase the artist's economic freedom.
A NFT is on chain and immutable. Further, they can have smart contracts where artists dictate advanced terms.
So you have more freedom and control in general. As to whether this leads to more monetary success is another question.
You know, this problem is a lot more generic than many think. There is no such thing as "forever hosting" for a fixed one time cost.