To me, the acid test is that if you haven't formed a separate legal entity for this site then it's not a startup. Of course, someone can do this for their week

To me, the acid test is that if you haven't formed a separate legal entity for this site then it's not a startup. Of course, someone can do this for their weekend project of building a lemonade stand so perhaps it's best said that it's a necessary but not sufficient condition.