Subscription plans renew automatically unless canceled at least 24 hours before the end of the current billing period.
After purchase confirmation, payment is charged to your Apple ID account. Renewal charges are handled by Apple according to the plan you selected.
You can manage or cancel subscriptions in your Apple account subscription settings. Deleting the app does not automatically cancel an active subscription.
If you use the same Apple account, you may be able to restore an active subscription on your device through the app’s restore purchase flow.