Or maybe Acme is afraid that FooCorp will refute their argument about a so-called "race to the bottom"... Maybe, just maybe, Acme is lying about "customers [...] switching to Acme in droves "...

I am not really impressed when a potential supplier is bad mouthing competition to get ahead of the pack. I would have a hard time trusting them, and being confident that at some stage they wouldn't bad mouth my company if I was no longer a client for XYZ reason later on....