Because software is bought from vendors that require Windows. This is often the case with Point of Sale software. OR the solution is a powerpoint or mp4 file r

Because software is bought from vendors that require Windows. This is often the case with Point of Sale software. OR the solution is a powerpoint or mp4 file running on a TV for signage. If every office computer is already Windows, IT has management applications like GPO, SCCM/Intune, or RMMs like Datto/Ninjaone to deploy policy and manage Windows computers remotely. It then makes sense to just keep using those, rather than making a whole new system just for the digital signage computers.