Actually all operating systems support PowerBoxes these days. It's an automatic part of the macOS Sandbox, it's a part of the FlatPak sandbox and there's an equ

Actually all operating systems support PowerBoxes these days. It's an automatic part of the macOS Sandbox, it's a part of the FlatPak sandbox and there's an equivalent for Windows too. You can also implement this yourself the way browsers do because every OS supports the sending of file descriptors and handles to other processes, and they all support kernel level sandboxing now.