Cannabis is an annual.

The only reason you can keep a mother for a very long time is that you don't allow the mother to complete her life cycle, which involved producing seeds, and then dying off.
Keeping a mother for many years indoors is very different from keeping a plant alive for many years of freeze/that cycles. Indoors, you are tricking her into behaving as if she was living in a single long summer growing season that you have extended to many years.

Killerweed, have you personally ever chopped a cannabis plant to ground and had it grow back?