You can do it in Windows with something like glasswire, or on OSX with Little snitch or equivalent. I run glasswire, and regularly see legitimate traffic from

You can do it in Windows with something like glasswire, or on OSX with Little snitch or equivalent. I run glasswire, and regularly see legitimate traffic from odd sounding processes. A non-technical user would have zero chance of determining what was legitimate and what wasn't. So whilst it is handy for technical users (who are willing to put in the effort to check all the various processes that make network access) it's not likely to work well for the wider user population