Counter for Swiss government administrative requests
TL;DR: Counter-page/Counter on homepage with the TOTAL of Swiss Government wiretapping requests to create twitter-shitstorm against the law and inform surveillance targets (e.g. whistleblowers)
Under Swiss legislation (SR 780.1 - BÜPF) one can`t prevent the state peeking into ones mailbox if they have a legit court order. And neither are service providers allowed to DIRECTLY report such a access/wiretapping to their user.
Therefore I propose to introduce a "Lawful Access Statistics"-page (similar to https://kolabnow.com/privacy/statistics) which shows the TOTAL of all law-forced administrative requests. Further there should be a newsletter/RSS for changes on this page and a tweet-button to tweet a change. A simple counter on the homepage (index.html) could redirect to that page.
GOAL 1) Create a shitstorm against the Swiss goverment each time they force access to the service thus gaining media attention for the issue (which could eventually lead to a change in legislation).
GOAL 2) Users who are exposed to government surveillance (e.g. whistleblowers) are low in number and normally know that they are endangered. They could take every change as a highly possible security breach.
GOAL 3) This idea is concistent with the protonmail practice of open information about the service (ie. threat model) and whould strengthen user trust in the service (-> PR).

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A. Meyer commented
The Shitstorm might be debateable but the Warrant Canary (https://en.wikipedia.org/wiki/Warrant_canary) is a good idea for sure.
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comment commented
A transparency report as Mega style will be enough.