To prevent any vendor lock-in, you do. All infrastructure and cloud costs are still under your payment method of choice. If we recommend a 3rd party service, you'll signup, provide your own billing details, and then give us credentials/access to the service.
We require a three month commitment at the start, but after that all of our plans are month-to-month so you may cancel at any time. As a courtesy, we can provide a detailed "exit briefing" to the new party taking over.