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I read https://webkit.org/blog/7675/intelligent-tracking-prevention... which details this.

They're just being a little sophisticated in how they block third-party cookies. This will hardly stop other tracking scripts, tracking images, widely-used fingerprinting techniques and related js calls. So nothing remotely close to even Brave let alone a TOR or the Epic Privacy Browser.

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We're trying to do the most extreme thing we can do short of blocking ads. To be more effective, you end up blocking ads, whether intentionally or as a side effect.

This blocks more than just cookies by the way, it affects all client-side state. And client-side state is still the primary and most reliable tool used for tracking, even though other methods exist, such as browser fingerprinting, behavioral fingerprinting, and IP-based tracking.

And something says me that ability to completely block third party cookies is going to just as magically disappear.

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