There are no legitimate uses, full stop.

As others have pointed out, it’s just a fully public database. Its use case is among trustless parties, and that’s why it fails. At some point, somebody is going to want to take action off the data and that’s going to involve a trusted party enforcing it. Sooo … just have the trusted party host the data (and make it public if you really care). And if all the parties are truly that trustless, 1) why are they dealing with either and 2) get a third party trustee to broker your deals