You can enable an app-level opt out flag that will disable Google Analytics across the entire app.

You can also turn off personalization for your browser by installing the Interest-Based Ads Opt Out extension.

Google is one of many ad networks that personalizes ads based on your activity online. Go to AdChoices to control ads from other ad networks.

Uncheck the box next to "Also use your activity & information from Google services to personalize ads on websites and apps that partner with Google to show ads."