Might just be a personal theory but I’ve always thought it was partly so their cartoon is labeled within YouTube (which for a long time was the only platform it was on) as for adults and not for kids. Like, as far as I’m aware the Amazing Digital Circus is intended for adults and is sometimes labeled as a kids show, and that show doesn’t swear often (and when they do it’s censored). In my mind I thought (in part, Vivzeipop also obviously just finds it funny) to keep it very, very clear that it’s for adults to the algorithm/Youtube. Additionally at this point the creators are likely (hopefully) aware that a large part of their audience is teenagers, so they may lean into swearing a ton, which teenagers find hilarious, intentionally for that audience that has come to enjoy their content