I'm don't "know" so you should take this with a pinch of salt but I would imagine it's because USD is the *World's Reserve Currency", by which everything is valued by comparatively. This means that other stock/shares/currency/crypto etc can be universally compared and traded with the understanding of comparative value at a glance using one standard of deviation.
The USD is actually only the 7th most stable fiat currency in the world so I'd doubt that it's based on that.
The prices shown here are obviously linked somehow with something providing bitcoin price as the BTC price fluctuates according to its current value and is pretty much live, with a little delay. The system used for this would be using the USD price for valuing BTC.
Anyways, I assume that is why.
The USD is actually only the 7th most stable fiat currency in the world so I'd doubt that it's based on that.
The prices shown here are obviously linked somehow with something providing bitcoin price as the BTC price fluctuates according to its current value and is pretty much live, with a little delay. The system used for this would be using the USD price for valuing BTC.
Anyways, I assume that is why.
