Stripe is notorious for this. I'm a founder who bootstrapped a business to $30M ARR in less than 3 years and Stripe almost killed us by kicking us off of their product without giving us a heads up

I started a business called OpenPay (getopenpay.com) to help founders like you. We can migrate your data / subscriptions off and help you get set up with a new payment processor.

Feel free to reach out to us on our website and we'll get you set up ASAP