Everything You Always Wanted to Know About SaaS but Were Afraid to Ask

What makes one Web applications “Software as a Service” (SaaS) and another a “plain old Web application” (POWA)? Or is there no such distinction?

Wouldn’t it be convenient if we had an answer that has some functional relevance? Here are the different axis on which I (unsuccessfully) tried to project Web applications to sort them between SaaS and POWA:

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