Never heard about it but for sure it wasn't that successful as we don't know who really use it if no exchange platform supporting it. The project should have been supported by volunteers running nodes for free if the transactions are fees free.
It gained some popularity during their time but that's only it. I no longer heard anything about them for more than a year.
In general, the concept is not that promising because there should be a cost for running nodes even without the mining process as we know it in other blockchains. The transaction fees are the rewarding system if there is no reward from the block validation. I think it is technically possible but it needs support from volunteers to keep operating.
I agree, there's a need to incentivize the effort for running nodes and helping the ecosystem of their project.
They have a good view and goal but, when there's no incentive for those who are part of the ecosystem that helps them to maintain the network working, it will not be maintained.
That sounds optimistic when there are no fees involved but there's always a cost for the feats they choose to highlight on their project.