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EXCLUSIVE: Naomi Wu and the Silence That Speaks Volumes
(www.hackingbutlegal.com)
This is a most excellent place for technology news and articles.
The short answer is that she reported a security vulnerability in a popular Android keyboard. It basically operated as a keylogger. The logical assumption is that the government was using that to spy on people (even people using secure messengers) and did not appreciate the secret getting out to the public.