Major currencies - US$, Euro, £, Yen etc - are managed by central banks which are given generally clear objectives with regard to money supply, inflation, interest rates etc.
The actions taken reflect economic activity - growth, unemployment, trade balance, public sector borrowing/surplus etc.
The value of a currency against another tends to move in fairly small steps as underpinning economic realities tend to change slowly. Exchange rates reflect current and anticipated future changes.
They don't always get it right but there is some effective control. This can of course be upset by the unexpected - eg: Ukraine, or crystallisation of the unknown - eg: outcome of Brexit referendum.
Cryptocurrencies have none of these linkages. Even horses are more predictable - at least they have some previous form which may be relevant, and the odds tend to reward higher risks with higher rewards.
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