It appears to be an idiom for a party in the wrong (Daily Mail for clickbait article) from being allowed to report that they were wronged (manipulated search results by Google) since the parent poster seemed to suggest that Daily Mail somehow deserved that treatment and two wrongs make a right.

That's a weird idiom, then, considering that Daily Mail is in the UK and Google is in the US. And considering that Daily Mail is not a search engine, so they're not comparable entities to begin with. And that I'm not even sure that Google was in the wrong here in the first place. So I was confused on multiple levels, apparently.

Per Wikipedia, 70% of the Daily Mail's web traffic is from outside the UK, mostly from the US.

Not quite sure what this has to do with the idiom's inapplicability, unless "country" in it meant "world". But clearly the reason for what you point out is that the English-speaking world is way larger than the UK.