In contrast, big companies like Apple try very hard to avoid and ignore user bug reports. There is no way to easily E-mail them, "filing a radar" is hard, and even if you do they do their best to ignore your report.
When I wrote "percentage of revenue", I meant it. In my software business (https://partsbox.io/), I dedicate about 10% of my time to reading, analyzing, and responding to user bug reports. Carefully thinking about every report let me catch bugs and problems that I never would have found. I also learned that every user bug report carries some information: even if something isn't actually a bug, getting multiple reports about it might point to a usability or a documentation problem.
If Apple also spent 10% of its revenue on processing bug reports and fixing bugs, they would not have a quality problem like they do now.