SupportAssist and PowerShell ExecutionPolicy

Issue

I noticed that when running PowerShell as Run as Administrtor on my  XPS 15 9560 and executing Get-ExecutionPolicy the result was Unrestricted - which is a definite security issue.  By a process of elimination it appears that Dell's SupportAssist may be responsible.

Diagnosis

Support Assist for PCs v 3.3.3 is installed on my Windows 10 Dell PC. But this may apply to other systems and versions of SupportAssist. The Service entitled "Dell SupportAssist" is set to Automatically start (Run services.msc and view that service). This service targets a file C:\Program Files\Dell\SupportAssistAgent\bin\SupportAssistAgent.exe"

The long and short of it is that I:-

1.  Reset ExecutionPolicy to Restricted with the PowerShell Set-ExecutionPolicy command
2. I then freshly rebooted my PC with the service set to the default Automatically Start; and rang Get-ExecutionPolicy: it was set to Unrestricted.
3. I reset it to the correct level  of Restricted with the PowerShell Set-ExecutionPolicy command
4. I then set the service to Manual and rebooted. The ExecutionPolicy remained at the correct Restricted setting.
5. I then enabled the service. The ExecutionPolicy immediately reverted to Unrestricted.

Would be interested to hear an official response from Dell please.