What measures can be taken to protect our devices from commercial spy apps?

Web: https://www.reddit.com/r/privacy/comments/11uzdxn/what_measures_can_be_taken_to_protect_our_devices/

I am referring to the type that are marketed to crazy spouses for example mspy

I am not referring to pegasus as that is outside my threat model

What can we do?

BTW I use grapheneos if it matters

apps devices privacy protect spy taken