It is build on top of Unreal, it seems you’ll be able to monetize your creations later.
You can script behaviours as easy as coding in Blender.
It has somme good features like voxel terrain and automatic vegetation system
I don’t think they will allow to export your game as a standalone as this would not work with Unreal license.
Also creations will be very limited if they don’t confirm the ability to let users import their own models, textures or animations.
(While they could integrate Unreal editor latest tools like animation editing, modeling and sculpting to let users make their own models in editor).
BTW, that’s a cool new Roblox like modding tool for people that like to mod.