Just so you know the switch will update before you go online.
So if you plan on getting mario kart and playing with your friends your have to update.
Keeping the switch 100% off line and never play games with other will stop all updates. Since updates can be sent to you via another switch system.
And there is no hacks for the switch as of today. Everything that has been release so far is basic crap. Its just getting into the web browser