You can use cryptography in a centralised system too. The issues with the fakes is more that its not supported / people try to work around the system. Why would a block chain backed system stay that way after they are entrenched? It’s layers on top and all those layers are separate layers that are trying to make money… that’s where there funding comes from and why they exist. Why would they not go down the same path since owning their layer gives that control. I have friends that were working exactly in that space and I saw nothing that made me think they would be any better besides currently being smaller