> No, it's not:
https://github.com/PowerShell/PowerShell/blob/master/license_thirdparty_proprietary.txt
I extracted the following text from the above mentioned license file:
---------
MICROSOFT SOFTWARE LICENSE TERMS
MICROSOFT .NET LIBRARY
4.
...
You may not
• work around any technical limitations in the software;
• reverse engineer, decompile or disassemble the software, except
and only to the extent that
applicable law expressly permits, despite this limitation;
• publish the software for others to copy;
• rent, lease or lend the software;
• transfer the software or this agreement to any third party; or
• use the software for commercial software hosting services.