They advertise themselves a permissionless blockchain ledger with no fees. I haven't looked much into their technology but assuming it holds up one possible us

They advertise themselves a permissionless blockchain ledger with no fees. I haven't looked much into their technology but assuming it holds up one possible use case is un-reversible data storage. What I mean by that is if I commit some data to the network. It gets passed to all nodes who keep a copy. The transaction that created the data has signatures so everyone knows it's me creating that data. No-one can overwrite that data. You can do the same on most crypto currency blockchains. i.e. put data in transactions.