Stopping people who have put in hundreds or maybe thousands of hours work into creating something from accessing that thing, is in my opinion a blatant disregard for their work.
Generally speaking, if you're putting in "hundreds" or "thousands" of hours of work into creating something, you'd probably know already what you're getting into initially and chances are you're probably gonna keep on subscribing. I'm pretty sure Scirra isn't gonna stop anyone from doing that.