Your metaclass.__new__ method returns None instead of the new class. The rule for calling __init__ is:

- if the constructor __new__ returns an instance of the type, then call the initializer __init__

- otherwise, don't call __init__ at all.

https://docs.python.org/3/reference/datamodel.html#object.__new__

Since your __new__ accidentally returns None, the __init__ is not called. If you change the line to say 

return super().__new__(cls, *args, **kwargs)

you will see that __init__ is called. (And discover the bugs in your init method :-)