I note decreasing the cost of living is by definition deflation. Preventing deflation is an explicit objective of central banks around the world.
I think there are gaps in our economic knowledge. There are different types of deflation, such as deflation through technology, deflation through a economy restructuring itself, deflation through cyclical unemployment. Central banks don't differentiate between them, and do all they can to prevent all of them from happening. It's like taking immune system suppressants because the white blood cell count is high, no matter the situation, even when it's high because you've got a cold.
Therefore, I think startups that can be involved in increasing our knowledge of the economics can increase prosperity for everyone, so central banks don't perform actions that prevent people from becoming prosperous.