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The easiest way to improve cookie privacy is to block 3rd party cookies by default. Adding new polices is not the right solution. 3rd party cookies are completely unnecessary.

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This will never happen. Google's entire ecosystem is built around advertising, so everything is an illusion of privacy. Things like 3rd party cookies will be the norm and Google won't block them, although firefox has started to head down that direction.

Chrome mobile, for example, can support add-ons and privacy features, but the risk to ad revenue is preventing them from making it available. Chrome being the default browser for Android means most people won't switch and they have >~80% marketshare.

Safari's Intelligent Tracking Prevention effectively blocks third-party cookies, at least for resources that are used in a third-party context on multiple sites. This google Chrome proposal also does it, but provides a dead simple workaround for trackers by sending SameSite=None and Secure with the cookie.

Let me guess: Google will tie the new proposal to a new Chrome setting which effectively identifies tracking cookies according to this new identifier, and will regularly purge them.

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