So many potential "fail" points for this entire thing.
First, it all relies on a very pretty graphic image, which most persons with a computer aged >15 could make themselves.
Next, it comes out right on top of a national Holiday & long weekend. Which means the actual companies represented are unlikely to actually respond, officially, for near a week (forever in internet terms).
Further, it is a "perfect fit" to push all of "our" buttons, and provoke the huge backlash and over-response it has.
Dovetailing into that is the hysteria mill which is the 'net; I've already seen this inflated to "WH raiding UPS and seizing all gunz" and similar hyperbole.
"Common Carriers" are a legally defining thing. There are a pile of laws about what and how and when. A person cannot just stick a sign on their ride and start delivering things for cash. So, companies engaged in that business are constrained by law, and by their customers' expectations. You don't get to change the rules part way through. Certainly not with a single letter.
If this were legit, there would have been cautionary notes. "Be advised, in nnn days, [company will [take defined action]." You are required to tell your customers, all of your customers, about a change in business practice.
So, there should have been dozens of letters, and emails, and official Company Statements. Not one, random one, stating it's a done deal, and, oh yeah, we are arbitrarily destroying somebody else's property in our custody for Reasons.
But, it fits into "our" knee-jerk reaction that "they" would up and destroy "our stuff" with no warning nor recompense, even though the stuff is not "theirs" to do anything but deliver.