This seems like it's on the border of a few markets to me. It seems to tackle the hobbyist use case pretty well. If it made pretty applications, and not just

This seems like it's on the border of a few markets to me. It seems to tackle the hobbyist use case pretty well. If it made pretty applications, and not just functional ones, it could be of use as an advanced mockup tool. If it produced Java code instead of just APKs, it could be a great prototyping tool, where you start here then you can hand this over to an engineering team who can start with this and not from scratch. If you had bi-directional Java<=>Thunkable support (the same way WindowBuilder or Android Studio do), you could have a Cloud IDE on your hands, which is where I start getting interested. For me, I couldn't stand using the blocks with a mouse, nor restrict myself to not using libraries, so despite the pain of working with Android Studio, it's still definitely preferable to using this. If it were a full on cloud IDE with great UI support, it could become a way for UX/Dev teams to work on the product together, where UX can tweak things and move them around as they like and check them into a branch of the real product, but I'm not really sure what it would take to get there since I've never really worked on Mobile UIs.