The ones who need to have a chat with the manufacturers are the authorized dealers who had biz taken off their plate by "unfair competition" and market manipulation.
IMO there is no way the manufactures were clueless this volume of games was being sold outside of their proper channels and chose to do nothing about it.
This goes back to parallel trading I brought up earlier.... this happens in a ton of consumer businesses
It is up to the manufacturer and brand holders to hold those they sell to accountable to their agreements and to call them out on selling outside of them.
If they chose to not do that in this case (which is likely) this shit is on them as much as anyone as they allowed this low pricing to fly and did not protect their authorized dealers.
Likely a big distrib was doing this and noone had the balls to tell them to stop (dont want to piss off the big buyers) and didnt care because end of day they still got paid.