If there was some logo and brand associated with that guarantee, consumers would prefer it, just like today some only buy organic or freetrade. Then manufacturers would want the extra sales generated by that logo/brand, and have a massive financial incentive to only apply the logo when the product is good enough.
Apple solved this by just never showing error messa...Your computer was restarted because of a problem.
Once the Mac has finished starting up again, the backtrace is easily accessible for those who want it. And if you really want to always see console output, you can turn on verbose boot permanently.
I like these openish interfaces because when it breaks, I can fix it.
Your device stopped working because the server it syncs with is gone because the company that owned the server is gone.
Who gives you your money now?
To do that, There could be a "Will Work Guarantee" organisation. The organisation will administer refunds to all customers with claims, (and combat fraud). Companies who want to be members of the scheme must pay into the scheme to cover payouts for their own products, plus a deposit for future failures of their products if they go bankrupt.
Can't imagine any downsides.
Related: MSI replaced 15 OoW mainboards without proof of purchase, too. They merely asked for serial numbers and shipped them out in a timely manner. Can you guess who's boards I used exclusively when building towers over the last 15 years?
The fault probably lies with the ISP, the router manufacturer, or someone else. Let the gadget manufacturers guarantee pay out, and they can try to chase the ISP themselves. If the issue doesn't get fixed, they can simply say "IoT doorbell (reliability guarantee excludes use with Comcast)"