Why would anyone choose fiat over Bitcoin? Unless it was your average Joe that thinks that cryptos are play made up money. But you're not going to find such people here. I remember telling my coworkers, showing them, "Look, Bitcoin was worth this in 2011, it is worth this now." And it would just not click. It just went in one ear and out the other.
But anyway, most of my money is in cryptos, and I want to diversify it in other coins. The more Bitcoins I have, the easier it is to do.