Probably because Google, Facebook, Insta, and TikTok need to constantly observe where the phone is, what and who it’s near, what’s being said, what’s being done

Probably because Google, Facebook, Insta, and TikTok need to constantly observe where the phone is, what and who it’s near, what’s being said, what’s being done on device, and so on. That’s a lot sensor access, a lot of compute, and a lot of bandwidth relatively speaking. The average phone with Facebook and without has noticeable battery differences even if both phones are left untouched (personal testing, I don’t have formal numbers for that last bit).