Speaking about Apple, the new iOS 14.5 will require you to consent to tracking, so Mark "Suckenberg" is not a happy camper:
Quote:
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“When submitting your app for review, any other form of tracking — for example, by name or email address — must be declared in the product page’s App Store Privacy Information section and be performed only if permission is granted through AppTrackingTransparency. You’ll also need to include a purpose string in the system prompt to explain why you’d like to track the user, per App Store Review Guideline 5.1.2(i). These requirements apply to all apps starting April 26, 2021.”
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https://bgr.com/tech/ios-14-5-releas...rberg-5921947/
I also use the Fire Fox extension "Facebook Container" to prevent them from following you all over the web. If you don't have a FB account, they will still follow you on the web. When you see this on a page, any page, you are being tracked: