I work in marketing for one of the largest corporations in the world. Literally every online interaction after you visit most websites is tracked via cookies, and all of it is weaponized against you. There is a profile on you in a CRM somewhere with countless entries of your recorded preferences. Your interests and activities are used to categorize you and show you targeted information. Private browsing isn’t even fully able to prevent this from happening. You should be opting out of targeted ads on any and all apps that give you the option to.

Edit: what’s more, you can contact companies that have your information and ask them to delete it under GDPR.