Radio waves, air, water and DOCSIS cable modems have one thing in common: they're all shared spectrum. Whatever you do affects everyone else in the same medium - and unfortunately, there are always dumbasses who ruin the fun for everyone else.
People trying to hack their DOCSIS modems and flashing firmware from other countries disrupt everyone on the same trunk cable. People thinking they'll just beef up the PA on their crappy wifi AP to get a better signal instead of adding a second AP cause enough noise to disrupt an entire neighborhood, especially if the PA output fries (part of) the bandpass and now there's side emissions all over the place. People burning wet wood in their ovens because they can't be arsed to dry it properly or, worse, outright burning trash stink up the entire 'hood. And people taking dumps in the rivers were enough of a problem in medieval times already that warnings like "it is forbidden to crap in the river on <day> because the next day beer will be brewed" [1] were commonplace.
People trying to hack their DOCSIS modems and flashing firmware from other countries disrupt everyone on the same trunk cable. People thinking they'll just beef up the PA on their crappy wifi AP to get a better signal instead of adding a second AP cause enough noise to disrupt an entire neighborhood, especially if the PA output fries (part of) the bandpass and now there's side emissions all over the place. People burning wet wood in their ovens because they can't be arsed to dry it properly or, worse, outright burning trash stink up the entire 'hood. And people taking dumps in the rivers were enough of a problem in medieval times already that warnings like "it is forbidden to crap in the river on <day> because the next day beer will be brewed" [1] were commonplace.
[1] https://www.abendblatt.de/vermischtes/journal/article1068323...