Again it is important to repeat, this type of activity is one long continuum. The IRS was previously used; federal contractors for the FBI have previously been used, and now the United States Postal Service is running a covert surveillance program against Americans that sounds suspiciously like the prior DHS announcement.
The Yahoo news article is filled with people saying they don’t know why. But that’s only because they have not been paying attention. The USPS has the systems in place to record every single package (sender and recipient), of every single piece of mail, sent anywhere at all times. They have a massive database of information on every single American.
So when you put the USPS statutory authority together with their technical capability, and then consider they operate their own police force… and then tie it together with “DHS Preparing to Use Private Contractors to “Scour Public Data and Social Media” To Compile Dissident Citizens for Watch List and No Fly Lists“…. what is described in the Yahoo article is almost identical to what we previously outlined.
Yahoo – The law enforcement arm of the U.S. Postal Service has been quietly running a program that tracks and collects Americans’ social media posts, including those about planned protests, according to a document obtained by Yahoo News.
The details of the surveillance effort, known as iCOP, or Internet Covert Operations Program, have not previously been made public. The work involves having analysts trawl through social media sites to look for what the document describes as “inflammatory” postings and then sharing that information across government agencies. (read more)
Now compare that description to what we previously outlined:

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April 13, 2021 
On April 8th the CDC said there were no issues with the Johnson and Johnson vaccine after several people reported reactions in North Carolina. [
The Big Tech ministry of COVID compliance has again removed scientific discussion that runs counter to the approved narrative presented by the ideological community. In this article we explain why….
The only reason New York can afford to do this is because they received a massive amount of bailout support from within the Pelosi-Biden blue state relief effort.