Companies don't legitimately intend to satisfy the GPL requirements.

If you put in a source code request and get no reply you should try to contact the copyright holder or someone like the Software Freedom Conservancy or the EFF, because they are breaking the law. There was a case recently in Germany where a court forced a maker of home routers to give up not just their source code, but also the scripts to install modified software - as required by the license. (As I understand it there is no precedent in a civil law system, but it does mean at least one judge believes Tivoization of GPLv2 software is illegal)

Please let the Software Freedom Conservancy know about any companies that are still in violation of the GPL by not satisfying requests for source code.

https://sfconservancy.org/copyleft-compliance/help.html

Why do you distribute under GPL if you don’t want to distribute the source?

There's actually a near-100% chance that the kernel on my device is not the upstream kernel. There's a near-100% chance that you have added some custom drivers or got them from your upstream. There's also a near-100% chance that you have written some scripts to install the kernel on the device, which you are required (at least one German judge thinks so) to share with me so that I can install a modified kernel on my device.

Again I see no purpose in doing things this way besides trying to minimize the amount of people who look at your GPL code for some reason. Isn't it more annoying for the company to make someone in customer support read paper letters, burn the GPL package onto a CD-R, and mail it than it is to simply host the GPL package for each product on a support site or Github or something and include a link in the product documentation?

You only have to serve those requests if you distribute your changes yourself.

So presumably as a hardware company you'd be offering your hardware with your custom linux installed, and then people wanting to audit or hack the product they bought would request the code from you.