Like pretty much every bank in Europe? Maybe you meant something else?

Revolut is interesting in many ways, but they get the interchange just like any other debit card issuer.

Most major banks in the US participate in Zelle, which enables free money transfers between consumer bank accounts. You can even setup unique Zelle users for your accounts at different financial institutions, so you can transfer your own funds between accounts at different financial institutions instantly and at no cost.

You're limited to $3000/day with Zelle and forced to use the much slower ACH or otherwise pay ~$25 for a wire transfer.

For transactions over those limits, you can break the payments up over several days. Wires are infrequent enough to disregard the fee (real estate transactions or similar).

I don’t know many folks moving more than $3k/day to be honest. I don’t disagree though that Fed ACH modernization efforts need to pick up the pace, as Zelle is a shim until federal payment infra is up to par with Europe.

Revolut also has a vested interest in making you spend whatever you receive using their prepaid card (that's how they earn money).

If you receive money from another user and transfer it out to your bank account, Revolut might lose some money from using the third-party that provides the bank transfer service. (I have no details on what their arrangement is.)

Revolut has been known to warn and suspend users that use their transfer feature too much.