Secretive Swiss surveillance firms like Crypto AG came to mind when I came across this.<p><a href="https://en.wikipedia.org/wiki/Crypto_AG" rel="nofollow">https://en.wikipedia.org/wiki/Crypto_AG</a><p>And the recent Protonmail:<p><a href="https://www.bbc.com/news/technology-58476983" rel="nofollow">https://www.bbc.com/news/technology-58476983</a>