Bear with me please. So, just using "default" profile and no associated email, i accidentally pressed the passwords menu. This opens an unlock screen that, i think is supposed to look exactly like the stock Android one but it is different. It prompts for a pin, which i didnt want to provide, but wouldnt allow me to back a page using 3 button back arrow (havent tested with gestures though) . SO i input enough incorrect pin codes. It rate limits you after about 5 failed attempts. Except i found if i repeatedly tap the back button quickly, the rate limit is instantly bypassed again immediately and i can continue indefinately until i guess the pin... Doesnt inspire much confidence yet.. but it's getting there!