Public blockchain-based cryptos certainly have a lot of their own problems, but not those problems. They aren't like numbers stored in a few privately owned computers. The ledger, transactions, and minting/mining process is transparent to everyone. You can't mint more or change the minting process without everyone else knowing and agreeing to it, you can't shut it down because multiple copies of blockchains are distributed over multiple nodes owned by anyone who cares to run a node, and you can't counterfeit the history because each link in the chain is uniquely bound to each previous link by the basic laws of math itself. The only feasible attack is to try to secretly take over the majority of the nodes (incredibly hard to do when everything is already so public), because if enough people are wise to your shenanigans then they can just reject your nodes if you're the minority, and if you're the majority they can hard fork the blockchain (ie: copy the original ledger only up to a certain date) and then continue on from there without your nodes interfering anymore.