"Technically?" Curious how you've even managed to avoid it, frankly – all of the largest US banks have it: Bank of America, Chase, Citi, Capital One, and Wells Fargo, as well as 1,536 other banks.

Going down this list, I don't think I've ever used a bank that didn't have it: https://www.zellepay.com/get-started

Zelle always felt to me like the banks chasing down the already-escaped cattle.

If you wanted a no-security-promises send-money-to-your-friends system, you probably already had PayPal or CashApp or something else of the sort. As far as I can tell, it's a popular fit for people who were scraping PayPal's "seriously, your selling-stuff-on-Facebook thing is a business, pay business fees" detection a little too closely.

The timing also seemed odd, with the promises of FedNow being "real soon now" -- do they intend to eventually run Zelle atop it, or is it an attempt to build an installed base (and vendor lock in) before every bank in the country can say "Well, we're all on the same network, so transfers are immediate for everyone?"