Security in Powershell
https://adsecurity.org/?p=1232

From Microsoft TechNet:
(https://technet.microsoft.com/en-us/gg261722.aspx)

It may seem odd to permit users to override an administrator-established value for the execution policy, but remember that the execution policy is intended to help stop unintended script execution. It is not intended to stop skilled users from executing scripts at all, merely to ensure that they do not do so without knowing what they are doing.