Suppose I sell a robot, which contains Raspberry PI.
Or somebody sells a workstation, which contains a PC and Monitor and WiFi router, each running Linux inside.
Or a car workshop sells cars with custom bodies installed on off-the-shelf chassis, which, most likely, have numerous chips inside, some of them running Linux. (These days almost everything is secretly running Linux inside)
How would these vendors comply with GPL-2, which requires that " 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, .... b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, ... "
How would a car mechanic even know what Linux is and which parts of his product contain it and where to get these sources? Does anybody actually comply with these copyright requirements?