First is common sense, computer viruses is a so common knowledge thing that scares many people, even my parents who are dummy on technology fears them and avoid

First is common sense, computer viruses is a so common knowledge thing that scares many people, even my parents who are dummy on technology fears them and avoid suspicous sites and malwares from unknown sources, same thing carries for apps (ie. don't install from second sources) Second is even if an android version lagging behing on security features from later versions, play store enforce enough harsh policies on app submissions requiring access to external data and collect user data, that you can trust most of it. Sure some apps can slip under their radar but play store bots can eventually catch up to them.