The files are provided in COPC (Cloud Optimized Point Cloud) format, an optimized extension of the LAZ format. This compressed and structured format allows for faster data access, especially for web dissemination use cases (such as Jakartowns), while remaining compatible with software that supports the LAZ format.
When a transformation is requested (change of horizontal/vertical CRS), the output is provided in LAS (uncompressed). If you explicitly choose the LAS format in the tool, the output will also be LAS. If you prefer LAZ and no transformation is needed, the tool delivers the native COPC (.laz).