In 2022 "a little birdy pointed out an accelerometer" to iFixit on their teardown of an M2 MBA: https://www.ifixit.com/News/62674/m2-macbook-air-teardown-apple-

In 2022 "a little birdy pointed out an accelerometer" to iFixit on their teardown of an M2 MBA: https://www.ifixit.com/News/62674/m2-macbook-air-teardown-apple-forgot-the-heatsink#:~:text=it%20run%20hot.-,Chip%20Identification,-That%20USI%20chip https://www.ifixit.com/News/62674/m2-macbook-air-teardown-ap... They could not figure out what it was for. Ars Technica commenters at the time believed it was to record drops so Apple repair teams could rebuff requests :)