A great idea of a product is some sort of unified system for companies to correctly manage subscriptions. There needs to be standards for what makes a user flow acceptable or not when it comes to cancellations.
Why would a company participate in this? Most don't seem interested in making cancellation easier.
I use privacy.com virtual cards. I make a card for each vendor, and define a limit for it. I can kill the cards anytime.
Paddle? https://www.paddle.com/billing/subscriptions
Stripe? https://stripe.com/billing/subscriptions
Paypal? https://www.paypal.com/us/digital-wallet/manage-money/manage...