Google rules the Android ecosystem - no matter how much AOSP. If you do something that hinders surveillance capitalism with a real effect you'll get excommunicated.
Leave that toxic ecosystem as soon as you're able. There are alternatives: #Librem5 & #Pinephone running #FLOSS software and letting users decide what they do want use, support and pay for.
Only real disadvantage: your personal data is not widely accepted as a currency.
Great work on FairMail! You made a difference, it seems!