the go keyboard application can also be used by the user.
on the other hand the go keyboard application also data sent by the Go Keyboard application includes Google account, device screen size, Android version used, including device model. This application can also collect other information because users often use it to type.
The whole point of POW is to secure the network with lots of hash calculations (hence the term 'work'). Phones have very little power (compared to asics, or even desktop cpu/gpu), so is it impossible for coins mined through phones to have any value and have a secure network at the same time.