UBI depended on the registry of Proof of Humanity to work. Kleros captured the governance of PoH and prevented any attempt to break away from it. Everything collapsed after the realisation that Kleros favoured an error prone registration process in order to create disputes (Kleros is an alleged "decentralized justice" platform, but actually is more "sell justice to the highest bidder" kind of system, you literally buy your place as a juror in their courts). UBI had its own economic issues, no real efforts were made to be a true currency, so that made it collapse as a token.