One thing is that Pixiv needs to work on cancelling membership subscription. You cannot delete your credit card. And even if I requested customer service they only said to cancel it on google apps or paypal.
You cannot rely on those methods. I want to physically remove my card. Not through google or paypal because it's not on my options. As much as I love the site they have $#*!ty $#*! methods to cancel your subscription.
Make it easier next time instead of relying on google and paypal.