I was a monthly donator to a public radio show. After few years I wanted to switch credit cards (with no intention of canceling or changing my donation amount). They had redesigned their website and there was no discernible way to cancel or contact them. I blindly emailed them, but never got a response. My only recourse was to cancel the credit card.

Since then I've greatly preferred a third-party to manage subscriptions. For awhile it was Paypal. In the past decade it's been Patreon and Apple.

[1] https://leginfo.legislature.ca.gov/faces/codes_displayText.x...