lets say usa dollar and all currencies will be highly devalued .....then how we know the btc value??
most traders use USDT so if something happens with usa dollar is my USDT Will be worthless over night?
If USD will be devalued then obviously the price of Bitcoin will rise but that price is pegged to USD
That's not set in stone at all
As there are lots of offsetting factors at play here. I guess we can safely assume that the dollar has been more or less depreciating all these years, I mean, during the era of cryptocurrencies, i.e. the last 10 years. And so what? Bitcoin rose to 20k, then collapsed to 3k, then collapsed again half a year ago to 4k from 9k. The obvious conclusion is that these other factors have much more influence on Bitcoin price that the dollar depreciation. It is also a factor indeed, but I wouldn't rely on it too much as it can be easily overridden by more powerful factors