Nintendo Switch

First off, SET UP TWO-FACTOR AUTHENTICATION! If you don't set up two-factor authentication, someone could hack into your Nintendo account and buy a bunch of games at your expense. That could be costly and you don’t want that headache.

Nintendo does a pretty good job with privacy, security, and parental controls. They did have a data breach in 2020 where 300,000 accounts were compromised and attackers gained access to users personal information, including date of birth and email addresses. That's not great.

It’s also good to be aware that while Nintendo doesn't sell your data to third parties, they do say they can share your data with some third parties for things such as advertising, which is pretty normal. They also say they may collect information about you from other sources, including sources that sell information. And if you log into your social media through your Nintendo, they say they may collect information from these third parties. Finally, some of the games you play on the Switch made by other companies might be collecting and sharing your data, so keep an eye on that. Overall we're not too worried about Nintendo. Still, it’s always good to opt-out of data sharing when you can.