Google Play service will warn you if there’s any harmful app running in the background
Technology is improving day by day, hour by hour and also some the cyber crimes. So, in order to make you a bit safer, the next update of Google Play service will keep on monitoring all of your installed background apps to check whether it contains any malicious code which can takes up and misuse your info. If there exist any app which comes under the harmful category, it will ask you to remove off that app at the same time, making Android much secure than earlier. So, unofficially its a free, must have anti-virus like thing your Android, developed by Google.
Lets see whether they can achieve a good and secure Google Play Service in future that can at least be a bit comparative with iOS environment. Do check your installed app updates, it can land anytime in near future.