Walmart is already preparing to adopt FedNow payments, and submitted comments during the public comment period.
https://www.pymnts.com/news/retail/2023/walmart-hints-at-ear...
https://www.federalreserve.gov/SECRS/2019/December/20191227/...
https://www.pymnts.com/news/retail/2023/walmart-hints-at-ear...
https://www.federalreserve.gov/SECRS/2019/December/20191227/...
They say it how it is.
But well, they probably never noticed it.
Neiman-Marcus is less likely to complain about their audience not having access to modern payment rails; they might kvetch about the cost of accepting a Platinum Amex, but that's a different debate entirely.