Zelle is only available in the U.S. Revolut is available in much of Europe (EEA) plus six countries outside of Europe.

https://www.revolut.com/en-US/help/profile-and-plan/verifying-identity/what-countries-are-supported

The reason that bitcoin sellers like to use Zelle is because it is fairly difficult for the payment to be reversed. A seller that has a Revolut Personal account is told that a payment cannot be reversed:

18. You can’t cancel a payment after it is made. This means that you can't cancel any payment which you ask us to make instantly (like an Instant Transfer or a currency exchange).

https://www.revolut.com/legal/terms/

In practice, if there is "unauthorized use" / fraud there are reports of sellers having their account frozed, and funds returned to the buyer.

A seller that has a Revolut Business account or a Revolut Pro that can find payments receveived be reversed, according to Revolut's terms of service.

8.) Even authorised Transactions may be subject to a dispute by a Customer, or otherwise reversed. We are not responsible for, or liable to you, for any Transaction which is later the subject of a dispute, refund, chargeback, other reversal or which is otherwise submitted without authorisation or proper basis. Rather, you are responsible to us for these things.

https://www.revolut.com/en-IS/legal/business-acquiring/

Bisq?