For some reason, for this iteration of the macOS, Apple would not allow you to download the DMG or ISO so that you can create a USB installer. It insists you use the internal Software Update to get the file. In the past, using this method would still get you this DMG file. You would download it, but then cancel the installation process when asked if you want to proceed with the upgrade. Fortunately, you can still get the installer DMG file officially from Apple by using the Terminal.
Type softwareupdate --fetch-full-installer --full-installer-version 26.0 in the Terminal. This will fetch the DMG to the Applications folder. Presumably when newer versions of Tahoe are release, you have to modify the number in the command.
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