Sure, so will all the real fintech payment companies that came before Zelle too, but you can’t count on someone to be interested in signing up. They might just say “no, screw that, I don’t like Zelle/PayPal/CashApp, I demand you pay me I with cash or check or I won’t work for you anymore.”
For all I know, they might even be banned from that app, and unable to sign up to retrieve my payment.