I did notice in the graph that it's a bit generic in this particular question, and it highly depends on the case. I do not know the details of your application to be able to fully assess which market it would perform better in (NFTs or non).
I believe that you have two different thoughts to get in line here, the applicability of blockchain in general, and the NFTs with their own blockchain.
For instance, some people might work out a platform on the Solana or Ethereum blockchain without the use of NFTs.
I also understand you do not want to push NFTs to your digital marketplace without a valid use case.
My advice is to read the full reference, they are explaining better than how I would ever do so: https://101blockchains.com/do-you-need-a-blockchain/