Especially if your complaint is "We got lots of growth because people adopted our open source software but then Amazon published a hosted version and now we can't claim as much of the commercial opportunity, so we need a more restrictive license."

Would the software have attained the userbase it did if they were the terms from the outset? A lot of these companies just assume that it would have been the exact same except for the absence of an amazon competitor if these licenses were used.