- people who can "hear" different ethernet cables to their system. Audiophile ethernet switches. - endless wittering about jitter, despite nobody ever getting a measurement of jitter in a system newer than about 1985 that would possibly be audible.
I'm not sure where most of it comes from other than some unscrupulous operators making devices that "solve" your jitter or ethernet issues with nonsense products that can't possibly work in the way the manufacturer describes.
It has made most of the forums worthless as sources of decent information about hi-fi. Any suggestion that the worries about jitter or digital cables (or even good old RCA cables) cannot possibly affect what you are hearing are shouted down by hordes of screaming jitter monkeys. Something of a shame if you were a beginner and wanted some concrete information about what you should be looking for in a hi-fi.