I know its a year old post but Im interested in this as well :)
So couple months ago I installed VIP mod from here with dmg multiplier from a friend :p, was nice and very helpful till the game got updated. Then since his VIP expired I downloaded the free mod. I noticed some difference here. The...
I think they only check your apk, if your apk didn't match with the system server then you'll get banned. Happened to my friend, I gave him my modded apk + obb since he dont want to download 1gb, he installed in nox emulator, in emulator mod wont work so it will be the same like using pure apk...