ProtonMail

下記の記事が出ている。

　ProtonMail strikes out at Google for crippling encrypted email service searches
　ZDNet: October 28, 2016
　http://www.zdnet.com/article/protonmail-strikes-google-for-suppressing-encrypted-email-service-from-the-public/

　Why did ProtonMail vanish from Google search results for months?
　Tech Crunch: 27 October, 2016
　https://techcrunch.com/2016/10/27/why-did-protonmail-vanish-from-google-search-results-for-months/