As long as you don’t go online with a dirty Emunand and don’t install dirty things on your Sysnand then you‘re good to go. A modchip by itself is not detectable by Ninty. It’s your actions after the modchip glitches the boot process that matter. Enjoy your chipped Switch!
edit: IMO this is risky behavior, but some folks run CFW and occasional homebrew on their Sysnand. I guess the thought process there is if you’re not cheating or stealing Ninty will leave you alone? I personally wouldn’t do it but to each his/her own.
edit2: hit up the dedicated
Switch Banning Hub.