Keeping repairs locked into your system of parts/techs can at least feign “safety” or “quality”.
But essentially just refusing to repair is an absolute fuck you.
I’ve started choosing the companies I use based much more on the experience offered when their product/service DOESN’T work, rather than when it does.
That’s the most dangerous part of it for sure. Inherently, the more a company has a monopoly over an industry, the less incentive they have to actually do a good job with anything.