Need some clarification on license of il2cpp.exe utility.
Does this utility itself subject to the same license as unity engine proper?
For example would it be ok to use just this utility alone as part of pipeline of some other project?
The il2cpp.exe utility is subject to the normal Unity EULA agreement. It does not have an independent or separate license of any sort.
To clarify; IL2CPP is part of the Unity Editor and as such is licensed under the same terms. To be unambiguous, this means you cannot integrate IL2CPP into your own product / pipeline separate from your usage of it as a licensee of Unity.