Heard this week that one of the big box stores - can’t remember if it was Sam’s or Costco, or similar one - who had been taking only AMEX but they have now changed that policy and have gone to VISA.
It was Costco. Saw the sign when I was in there with my MIL last month that they were switching.
Amex was looking out for their bottom line and a new agreement with Costco wasn't going to help it.