android is more secure than windows operating system. becasue it is linux based operating system. linux based os is much safer than other os.
Has Android system spying for private keys?
I think no.
But if you install any third party or mod apps from an unauthorized source that is serious harmful for your whole system as well as your wallet. because they can inject any kind of malware on your system.
or if you use any kind of custom rom which is not open source that's must be harmful for your system.
I mean on a pure Android without any installed apps excepting crypto wallets + google play
if you use pure android i think there is no worrie about stealling wallet.