1. You're looking for a very specific person.
2. You want to unconstitutionally punish somebody for free speech, and you don't care who, you just want to cheaply find a convenient victim.
In that respect, tracking-dots are an invitation to #2, since they don't really need much in the way of human labor-hours or focus.
Printers send telemetry to the mothership, including serial number. Anyone under NSL cannot disclose that fact, so it's possible (probable) that if OEMs are pulling serial numbers, computer names, usernames, registered owner names, IP address logs, that they are NSL to retain and/or redirect that data feed.
It explains why everything, everything is so ****ing leaky with your information (beyond just advertising). Where do you think our modern machine learning came from? It was in order to process this stupendously gigantic mountain of data! I'm sure Utah was running some less efficient prototype of the learning we see in the public today back in the time of the GWOT!
So no, it's not just to confirm, as a few privileged individuals [at best] can go to terminals and pull up gobs of information. This is one of the reasons seeing-sphere-company's stock has done so well recently (money money for me)!