Well that's pretty simple when you know how transaction banking works.
Venmo, PayPal et al are basically internalizers, which means they are using a private ledger and most transfers are internal bookings that are instantly cleared. In order to get access to the system you have to onboard to the payment provider and that is a major hurdle for everyone who does not have a bank account.
Instant bank transfers work slightly different. When you see the money on your account a couple of minutes after your counterparty sends a transfer, your bank basically gives you a credit line for the amount because banks settle after t+x. Wires, ACH, SEPA or Tipanet would be way too slow for instant settlement.
And here you have three major advantages of a distributed ledger which basically are the basis of the success of cryptocurrencies:
1. You don't need to onboard anywhere. You only need internet access (smartphone) and a public key to participate in transactions. This is true for the redneck who only deals in cash as well as for the dude who usually has to exchange his local currency into USD on the black market in LatAm. No need for the black market anymore as well as for payment providers.
2. Transactions are instant because there is no settlement. It takes seconds to send millions of US denominated stablecoins and this is true for the payment to Starbucks and to a dropshipper in Thailand.
3. You can follow the money endlessly without any interuption as every single transaction is recorded forever on the distributed ledger, which is a major advantage for law enforcement, the IRS and secret services. Think about how much effort it is to follow a guy who collects terrorist financing 50$ wise just to send an international wire from his bank account to some guerilla group in Irak. It did not take too long to figure out how many BTC the Hamas received since 2019 because the adresses were known and they cashed out via Binance. This probably was found out by only a handful of analysts.
Transaction banking today is a dumpster fire of layers upon layers upon layers of middlemen, clearing services, internalizers, transaction reporting companies, local and national banks. Banks today spend more money on backoffice and administrative staff than they do on trading or creating new products.
The entire system is just incredibly clogged and inefficient. Average Joe doesn't realize that because all he can see is...well, a couple of colored buttons on his iPhone
The thing that most crypto haters fail to see is the fact that it's not about making an existing system better. The average American guy is so integrated into payment systems that he probably even won't see a difference between distributed ledger technology and his good old PayPal. But the focus isn't on first world blue colar slaves.
It is on including the average Joe of 2nd and 3rd world countries into the USD currency system and at the same time being able to follow all that money around no matter where and when the transaction took place