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There are likely cryptographic ways to protect identity, combined with ways to prevent aggregated data analysis.
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similar challenges in e-voting: anonymity of voter, secrecy of vote, but verification required โ€” hard crypto problem
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Replying to @maznu @pwaring
In this context, you want to be able to verify that the service authorised the user; but not for what or why. Voting harder.

Dec 15, 2016 ยท 5:52 PM UTC

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Replying to @dsilverstone @pwaring
indeed, voting has other constraints like "once only"
Replying to @dsilverstone @pwaring
my linking AV with evoting is because I don't expect for-profit cheapest-wins AV provider to appreciate the challenge