A.

Yes, you should be worried about this.  Google Analytics is Google’s widely used website data collection tool.  It is embedded in websites and runs JavaScript code from your browser, which has the capability of collecting virtually any data on or about your computer, including things like location, and sites visited.  It can also be used in conjunction with other Google tools, such as Gmail and the Chrome browser to specifically identify your email account and activity.  This, of course, is taken and used by Google’s massive data business in numerous areas, such as advertising, and is an ongoing threat to your privacy.  The Brave browser and script blockers can block Google Analytics scripts from running.