[ndesaulniers]

As a thought experiment, such content would likely be encrypted. The request size can give away the content type, but speech-to-text could be done on device, making it harder to guess the contents based on request size (assuming the identified speech would be significantly smaller compressed relative to audio).

[taneq]

Then correlate speaking with CPU usage. Processing audio is always going to have /some/ cost /somewhere/, and likely one we can detect for the time being.

[oe]

Processing doesn't have to be real-time

[taneq]

It does if you want to catch everything that might be important.