It means the extension is no longer being updated as it's not part of our engineering team's focus at the moment. It's functional and it will not be switched off, but:
We are not adding new features to it anymore.
We are not able to troubleshoot issues that you might come across while setting up the extension.
We stop updating some extensions if they don't reach enough demand from our users. We don't have any plans to switch them off anytime in the future.
How to test an extension before buying a subscription?
You can try any extension before subscribing by using the free trial.