I have a modded Switch that hasn't been banned, here are a few notes about it. Hope these are useful:
- 2017 Switch running 10.0.2 and Atmosphère 0.12
- All games legally purchased from eShop
- First booted Atmosphère in late 2018
- No sigpatches ever used
- Homebrew booted from Homebrew Menu only, no modded .nsps installed
- Modded saves only for offline games
- Never cleared error logs
- System monitor overlay used when connected to the Internet (but not during online gameplay)
- EdiZon overlay used only when offline, completely uninstalled when playing online
- System updates, game updates, eShop installs, and online multiplayer only done when booted in stock sysNAND mode
- eShop and online multiplayer all accessible