I personally suspect that security services visited the newspapers a few days after the leak [1], and ever since then, every article has been about stuff that wouldn't be a surprise to rival security services.

Sure - it was a surprise to the public. But rival security services I'm sure would expect US controlled backdoors in US made technology.

[1]: https://www.theguardian.com/uk-news/2014/jan/31/footage-rele...