Vaadin Pro is for life ?

Hello,

We are developping apps using Vaadin. We are interested in the dialog pro component (and maybe some others).
We are open in suscribing to the pro vaadin during the time we develop our apps.
But what about after that time ?
If we stop the pro suscribing, will components stop working ?
Are we bound to paying pro vaadin for as long as the app is in production ? (which can cost us a lot over the years).

I don’t find documentation on that.

Thank you in advance for you answers.