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If you have an Apple Developer account:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSur --nointeraction macos big sur iso download
However, there is a legitimate, safe path to obtaining a Big Sur ISO, though it requires more effort than a simple download. The technical community has established a consensus on the "DIY" method. This involves downloading the official, verified installer directly from Apple and using built-in terminal commands to convert the .app bundle into an ISO image. This process typically involves creating a temporary disk image, mounting it, writing the installer files to it, and converting the result. This method ensures that the source material is safe and unmodified, bridging the gap between Apple’s proprietary distribution and the user's virtualization needs. : : If you have an Apple Developer