The added value you're referring to accrues almost entirely to the exchanges.

People and businesses are not buying crypto to spend on things. They are buying it to trade it back and forth. No value is being created except for the fees exchanges can charge for processing transactions, which is a markup on the fees already charged by miners.

A large percentage of Americans were onboarded to investing via brokerages in the 70s-00s. Did that make day trading any less zero-sum than before?