ou need 1 Google Play account that has a credit/debit/virtual card attached to it.

Each time you create a new Netflix trial choose your card on your Google Play account as the payment option.

As you’re choosing your card (which he calls “Google Play Billing”) as your payment option, the Netflix app will not detect that you are using the same card over and over again as it doesn’t actually see your card details it would just bill you through Google who are the ones who have your card details. When Netflix asks you for your details on your phone it pops up like an IAP.

This would work assuming you remember to cancel the trial account otherwise you would get billed.

So each month you would have to

1) Cancel your previous Netflix trial.

2) Create a new email account (not necessarily a Google account).

3) Create a new Netflix trial with this email address.

3) Choose your credit/debit/virtual card that is registered to your google account on your phone.

Up to you whether or not remembering to do this every month is worth saving the £5.99/£7.49/£8.99 you would save.