That program is just a dashboard for quickly configuring group policies and the Windows firewall. It's programmed for .NET, if you don't trust it decompile it, get the list of policies and their values and set them manually. ILSpy does a great job at decompiling it. For the firewall part you can install AdGuard Home[1], set it as your DNS and add the host lists[2] if you want it to auto update or use WindowsSpyBlocker[3] and keep it updated manually.