By default the Nintendo Switch eShop shares your data with Google Analytics. If you don’t want to feed your activity to “Big Data” you can change your settings with a few easy steps.
On your Switch go to the eShop.
Select your profile icon that is on the top right.
In your profile section you’ll see Available Funds and whatnot. From there, scroll all the way down to the bottom and you will see the Google Analytics Preferences.
Just click the Button that says Change, and on the next screen select the Radio Button that says “Don’t Share.”
That’s it! Note, if you are also on the Japanese eShop, the option is there too.
Here’s some other news on the same topic:
PSA: By Default, Nintendo Now Collects Data Through Google Analytics On Switch eShop (North America) [Nintendo Life] https://www.nintendolife.com/news/2020/12/psa_by_default_nintendo_now_collects_data_through_google_analytics_on_switch_eshop_north_america