No, Xiaomi is crazier, they send something every 5 seconds once the phone is awake and every app of their built in app suite will do the same. I've observed this with a dns filter app. I've owned many phones and I've never seen anything this crazy
https://arstechnica.com/gadgets/2021/03/android-sends-20x-mo...
> When idle, Android sends roughly 1MB of data to Google every 12 hours, compared with iOS sending Apple about 52KB over the same period. In the US alone, Android collectively gathers about 1.3TB of data every 12 hours. During the same period, iOS collects about 5.8GB.
The custom roms were not an option since i needed google's safety net feature but i got a different phone eventually