Question about free market and taxation

Let's say the government didn't enforce any particular currency on it's people, so anyone is free to use bitcoin, copper or whatever they wish. A free market in monies, essentially.Let's assume also that we retain the need for some sort of taxation or another way of funding for the government so that they could provide only the most basic services a government should - protection of private property, peace, and freedom.My first assumption is that in such a scenario, people would choose to pay taxes in the most worthless money they could find or make up, making it so that the government obtains almost no funds or only obtains monies that no one is willing to accept as payment, and thus can't provide even the most basic of services that we have agreed on.BUT - i also have a feeling i'm somehow wrong. If you have made 0,01 BTC this year and have to pay 5% of it in taxes and choose to do it it in Zimbabwean dollars or treeleaves, you wouldn't win anything because - well, you would still lose 0,005 BTC obtaining Zimbabwan dollars or a LOT of time collecting treeleaves, since the government would evaluate them to be basically worthless.Would a free market in monies somehow interfere with the governments ability to obtain the minimum necessary funding? Thanks! via /r/Bitcoin https://bit.ly/3p3HoF0