I flashed the EU (BA version 18.104.22.168) and still see the crappy Login with OnePlus account (Red Cable Pro nonsense) and thought it was to do with Indian devices. So, flashing EU is not getting rid of it? Do you see it as well?
Yup. Run these adb commands to remove all the bloat:
Red Cable Club in settings :
adb shell cmd package install-existing com.oneplus.membership
Cloud Services: adb shell cmd package install-existing com.heytap.cloud Work-life balance: adb shell cmd package install-existing com.oneplus.opwlb