Exactly why I don't want to use an apk and will wait for store update. Mr. Hanke, the Niantic poo is way too nitpicky and ban happy.
I wouldn't had done it either but there are some reports that claim the new update will block all CyanogenMod users. That's the basic OS of my phone, the OP3. That's why I wanted to try it first before I update the app through the Store. Since it seems to be working I have no need for the APK, I can wait for the official update.
Although I have postponed my walk all day long until the update comes out lol.