[w3ctag/design-reviews] Early design review for the FLoC API (#601)

HIQaH! QaH! TAG!

I'm requesting a TAG review of the [FLoC API](https://github.com/WICG/floc).

In today's web, people’s interests are typically inferred based on observing what sites or pages they visit, which relies on tracking techniques like third-party cookies or less-transparent mechanisms like device fingerprinting. User privacy could be better protected if interest-based advertising could be accomplished without needing to collect a particular individual’s exact browsing history.

The FLoC API would enable ad-targeting based on the user’s general browsing interest, without the websites knowing their exact browsing history.

Please read the [Security and Privacy self-review](https://github.com/WICG/floc/blob/master/security-and-privacy-self-review.md) for the privacy goals and concerns.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/floc

  - Security and Privacy self-review²: https://github.com/WICG/floc/blob/master/security-and-privacy-self-review.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/WICG/floc

  - Primary contacts (and their relationship to the specification):
      - Yao Xiao (@xyaoinum), Google
      - Josh Karlin (@jkarlin), Google
      - Michael Kleber (@michaelkleber), Google
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): TBD

Further details:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG
  - The group where standardization of this work is intended to be done ("unknown" if not known): Unknown
  - Existing major pieces of multi-stakeholder review or discussion of this design: Unknown
  - Major unresolved issues with or opposition to this design: None at the moment
  - This work is being funded by: Google

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  🐛 open issues in our GitHub repo for **each point of feedback**

  ☂️ open a single issue in our GitHub repo **for the entire review**

  💬 leave review feedback as a **comment in this issue** and @-notify @xyaoinum, @jkarlin, @michaelkleber

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https://github.com/w3ctag/design-reviews/issues/601