I don’t want to be rude but I do always wonder what the point of taking arts degrees is in this day and age. If you’re passionate about some art you can still follow and practice it along with your STEM studies, it’s not like most pro/successful artists were formally trained from teenage. Why set back your chances of making decent money?
Don’t all Android systems (at least on the same version) have the same APIs and file systems? Don’t apps made for Android run on all Android devices running the targeted version? Why would the cosmetic layers of adware that OEMs pile on AOSP turn phones into different ecosystems that don’t interoperate?
But a rogue app can take everything from your phone - your pictures, emails, contacts, docs… without anyone being the wiser since there is no Administrator oversight. On organization Windows systems the user at least requires Administrator permission to run anything that can pose a risk, but he could do the same on Android without anyone stopping him. Dumb people will love to download and install Google_Pay_mod_Unlimited_money.apk that could scoop up all data (including company emails, slack, etc that he is running on his phone) and no one would ever know.
The fact that WhatsApp is so crucial may very well be the reason. In India and places in Europe, WhatsApp is literally a direct replacement of texting, which means it contains communications from practically everyone and everything - your workplace, your local government, your grocery store, your gym, your friends and family, public services, etc. And since your chats themselves are E2E encrypted, the background usage data Meta can extract from users will be too dirty and unmonetizable.
Their interactions on Facebook and Instagram - now that’s rich data. They get to know exactly where and with which people your preferences and interests lie.
You chances of being miserable out of poverty would be way more though, if you’re not already well-endowed. You may not want so much to maximise your earnings, but you definitely don’t want to get stuck in a poverty cycle because of having an expensive non-marketable degree.