Hi Denis
Kodular is an active project and will continue to be supported for a long time. We have no plans to shut down Kodular or restrict any services.
That said, our documentation is still on the weaker side due to resource constraints (our team is just 8 people). As @Mika mentioned in a post above, you can contribute to writing the docs too, something that’d be greatly appreciated by us. 
If you’re considering switching from Thunkable, I’d recommend you remove any Thunkable-specific components (like the Image/Emotion recognisers) and proceed with importing your projects. We plan on providing support for iOS once MIT finishes work on the iOS development suite, so Kodular will soon be as cross-platform as Thunkable X.
I hope this clears any questions/doubts you may have.
Cheers