When your subscription expires, you won't be able to load your project in the Visual Studio extension for AppBuilder. Therefore, you won't be able to build the project with your changes. However, any projects that you keep locally on your computer will still be there, so you can access your code if you need to.
If you aren't using any of the Telerik Platform services like Analytics, Feedback, Backend Services, your app will keep functioning after your subscription expires.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items