Not only Google, any site where you have to pay on monthly or annually basis requires OTP only at your first payment.
Most of these sites/apps give first month free subscription but you are required to add CC details to avail the free subscription.
And after free period is over these guys can...
I want to sale my space grey iphone 6s plus 16 Gb. Its indian and have warranty left for around 220 days approx. ( invoice has been misplaced but i have box and all accessories.. earpods are unused cuz i was having an older pair).
My actual fon was sunk in water accidently and has been replaced...