Personally I would never allow any app to use my microphone all the time, effectively being able to monitor a certain area around the device it is running on all the time. This is gross.

This is all the more true for an app from a company that did transfer sensitive user data to third parties in the past.[0]

In Germany, under certain circumstances, it is also illegal to make sound recordings of persons without their knowledge.[1] This might be the case in other jurisdictions too.

[0] http://www.google.com/translate?hl=en&ie=UTF8&sl=auto&tl=en&...

[1| German Civil Law Code § 201 
– Breach of confidentiality of the word: http://www.google.com/translate?hl=en&ie=UTF8&sl=auto&tl=en&...