I was speaking from a UK perspective which, as another commenter says, is mostly co-ax from a point on the pavement. 'Actual' FTTP is coming in now, like HyperOptic, starting with apartment blocks where they can get lots of customers per one new civil engineering job. Most consumer telecoms fibre networks in the UK were laid in the 90s and don't go right to the home.
If you're in the lucky situation of having true FTTP, then it's still very unlikely such fibre could be used as a 'microphone' because of the sensitivity and spatial resolution issues. It would also be pretty obvious it was being used because it would probably interfere unless they were very careful with bands. So don't worry, DAS isn't going to be used to listen to your voice. Much easier to do that with your phone!
If you're in the lucky situation of having true FTTP, then it's still very unlikely such fibre could be used as a 'microphone' because of the sensitivity and spatial resolution issues. It would also be pretty obvious it was being used because it would probably interfere unless they were very careful with bands. So don't worry, DAS isn't going to be used to listen to your voice. Much easier to do that with your phone!