When signing up to the subscription you will pay a fee for ALL of the tools. You will then receive automatic access to all new updates, upgrades, added compatibility, training and support.
When the subscription ends it will require renewing to continue using the plugins.
You’re under no obligation to automatically renew. In the Billing section of your account you can opt to either pause the subscription renewal until you choose to renew again, or cancel altogether so that when it ends, your subscription will cease to exist entirely.