- no, Google won’t contact your phone to patch it. Those who release the ROM either need to include the firmware that carries the patches or ask users to get them via a stockrom install (or extraction). Murena aims to include the firmware, it’s done for some devices already and you can be sure they’ll do it for devices they sell. Pixel 4 is already close to EoL, though those exynos baseband issues got updated in march in firmware. If you care about the modem firmware you must get a newer Pixel. Replied to a Pixel 4 lifetime question here - Pixel 4XL "support" lifespan - #2 by tcecyk
- you can be reasonably sure by watching the network traffic over a longer time period after you modified the places in AOSP that reach for connectivity. See the studies - https://e.foundation/wp-content/uploads/2020/09/e-state-of-degooglisation.pdf - if I’d be paranoid as an individual I’d worry about carriers and the modem firmware rather than Google. Google doesn’t care if some AOSP mods drop out the ginormous data pool
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