The problem with Zelle is that it's not safe to use for anything except payments to friends and family. The Zelle user agreement [1] puts this warning in all-caps:
"YOU SHOULD NOT USE THE ZELLE® SERVICE TO SEND MONEY TO PERSONS WITH WHOM YOU ARE NOT FAMILIAR OR YOU DO NOT TRUST. ZELLE® DOES NOT OFFER A PROTECTION PROGRAM FOR AUTHORIZED PAYMENTS MADE WITH THE SERVICE"