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Re:Ask HN: Is anyone monitoring popular apps to check if the... by angelzen on Sunday September 19, 2021 @11:47AM (#28585262)
Average person speaks 16k words per day. Android considers app background traffic excessive at 50MB / hour, which is 1GB / day. 10% of that rate to steer clear of raising red flags is 100MB / day, about 10kB for each word you speak. Rather trivial to steganograph a word in 10kB of background traffic.

https://www.scientificamerican.com/article/women-talk-more-t...

https://developer.android.com/topic/performance/vitals/bg-ne...

Re:Ask HN: Is anyone monitoring popular apps to check if the... by fsociety on Sunday September 19, 2021 @12:10PM (#28585455)
You have to calculate the amount of data provided from all users in this case + storage + processing power to do all of that. It’s probably more than you would expect too.

The second point is why would a company do that? If the NSA or whomever wants to snoop on you, they’ll drop malware on your phone, subpoena your iCloud backups etc. not try to coerce a company to record people’s conversations when said company has no desire to do so.