as part of a subscription, can users stop their subscription themselves at any time?
Yes, end-users can manage & cancel their subscriptions to your studios.
On the account page of a studio (accessible by clicking on the account icon in the top right or visiting www.studio_url/account) they can see their current plan and a button to manage their subscription. Depending on what plan they’re on, this button will say something slightly different. I’ve included a screenshot of it.