But here is the critical question:

to create a bootable USB with this DMG file once you've extracted it? Download MacOS High Sierra DMG File (Safely & Legally)

With the DMG mounted, you'll see a .pkg or an installer application inside. Double-click to start the installation process. Follow the on-screen instructions to install macOS High Sierra.

If you're looking to create a bootable installer for macOS High Sierra, Apple provides official guidance on its support website. This approach not only ensures legality but also helps maintain the integrity and security of your system.