A lot of people won't admit to piracy so they claim to have been banned for stuff like theming HOS or using homebrew while connected to the Internet :eyeroll: but really it's piracy. I was banned for piracy, and so was everyone I know who was banned. I've never actually met anyone who claimed IRL to have been banned for silly stuff like theming. Not when they have to look you in the eye while they say it.
I was banned for injecting a 100 % completed savefiles from a game, however, I didn't have the addons on my original game and didn't realised it back then. It took my a while to understand why I was banned because I never installed pirated content on my console
I wasn't using the switch to pirate games then but since I gor banned, I do use custom forwarder a lot.