I have nothing to hide, but I will hide it anyway.

I don't know where I read it but the best defence to "if you have nothing to hide you have nothing to fear" is "I don't have anything to hide but I don't trust your judgment or intentions"

investigative journalists in authoritarian countries

You mean like the US? Who achieved the feat of persecuting a foreign journalist as if he were an American citizen?

EDIT: I know that Mullvad is also critical of american surveillance, but I find it very funny that when in the West they call a state democratic that does exactly the same (or worse) than a state in the East that they call "authoritarian". It really reveals how empty of meaning this word is. "Ah, but these Western states have 'democratic institutions'." News for you: the states you call "authoritarian" have them too. In both cases, they can be and de facto are dictatorships.

There are a surprising number of grammatical errors in that blog post. Did anyone proof read it, I wonder?