Just heard the fans on my 16" M1 Pro for the first time -- after 5 months of ownership. I was plugged in, sharing my screen in a video call and heard a faint noise. Had to put my hear to the computer to make sure it was indeed the fans. I have the computer setup to be on low power mode when running on battery and mostly work on battery, so even when on Zoom or Google Meet and sharing the screen while loading heavy websites (e.g. multiple instances of Google Ads), the fans had never turned on. Finaly, I know for sure that my computer has a working (and almost silent) fan. Mind blown.