Playing with video game economies tells me that any tax on owning money/e-money would simply lead people to deal with an alternative, unpenalized store of wealt

Playing with video game economies tells me that any tax on owning money/e-money would simply lead people to deal with an alternative, unpenalized store of wealth. I don't know how plausible that move is for the real world, since we can't all suddenly start pricing things in terms of potions and scrolls, but what's stopping this from making Bitcoin, or any coin as the people's de facto currency?