It is because it is an untouchable currency and also because it grows very fast and noone can known to whom we are sending the money
But is the most expencive currency in terms of fee because as the demand of btc will rise the fee will also incresase
And this bad or a currency but i will be till 2050 because after yhat all the btc will be mined and their will be no miner
So it good
Bye