Kleros provides a system that allows smart contract in natural language to be written by letting randomly drafted juries evaluate the contract. It seems to me that this principle is incredibly powerful for all sorts of real world applications whether it's arbitrating the outcome of a prediction market or making sure that the events listed in the prediction market follow rules spelled out in natural language.
At the moment it seems like Ethereums transaction costs are still limiting the utility of Kleros but either further progress in Ethereum or a Ethereum Virtual Machine on another chain is likely soon able to allow Kleros to provide the services more cheaply.
Kleros Market cap is currently at $58,597,050 (with $73,236,896 fully diluted) which is relatively low compared to other crypto-assets especially given that it has potentially so much real world use-cases compared to a lot of other blockchain projects without real world usecases. Either there's some argument against Kleros that I'm not seeing or it should be valued 100-1000X of what it's current value happens to be.
As a defi user / Ethereum dev, there are two things that seem relevant:
Many of the use-cases for which Kleros seems good for (e.g. arbitrating social contracts, prediction markets, etc.) is not where most of the capital is on Ethereum. Most capital is engaged in various overcollateralized lending/borrowing, LP, derivatives, synthetics, etc. So until we see additional applications which run on the social layer, I don't think the utility of Kleros will be made that apparent.
Partially related to the above, the lack of social-based applications I think has to do with a combination of generally poor UX and high latency for Ethereum. We're seeing some exciting updates on this front with rollup solutions like Optimism and zkSync which can provide ~10x increases to start, but again, the ecosystem hasn't really caught up.
More broadly, I think that attention in crypto markets shifts often, and valuations are kind of all over the place. I think I believe that scalable protocols for dispute arbitration if done well can be worth several multiples of Kleros' market cap, but also it's unclear if Kleros is that specific protocol? I personally need to dive into this more.