How to create a bootable OS X Snow Leopard USB drive? - Ask Differenthttps://apple.stackexchange.com/questions/400472/how-to-create-a-bootable-os-x-snow-leopard-usb-drive
As another user noted, the Balena Etcher method works great on a Mac. On my 2021 MacBook Pro (with M1 Pro chip), I created a bootable OS X Snow Leopard USB drive using a .DMG of Snow Leopard I downloaded on the internet. And then installed Snow Leopard on a 2009 MacBook Pro without a hiccup.