The act of savings is a net gain for the economy. Holding bitcoin isn’t taking anything from anyone, quite the opposite, it’s putting real resources into the economy and not taking anything back out.

As far as what bitcoiner do with it, they do everything one would do with money. Because it’s just better money. I live on a bitcoin standard. I get paid in it, I pay people in it, I save it, I spend it. It’s money.