A conspiracy theory would be putting an intentionally buggy one in their free offering. It would have to be buggy by design such that it would be incompatible with a later patch. Then put non buggy design 2.0 in the paid product. Perhaps the inability to design a bad design like that is why that scenario hasn't been initiated. Sometimes it is hard to think of intentionally bad code, although it seems easy enough to generate when I'm trying to write good code.