I was away from crypto for years and now I'm trying to get back into the game. I was really STUNNED that there is no exchange, even after many years since bitcoin started, that we can just deposit USD and start exchanging altcoins. I hope I'm wrong because this would be the single biggest hurdle for altcoins to be widely adopted by general public. There are just too many hurdles to jump over just to START trading.
Each exchange has its own policy of adopting the Fiat, as well as looking at which country is based. But exchanging Fiat for a coin is an easy thing. But the amount of the commission is another matter. This is what many do not exude. But in the future there are changes, especially after the implementation of quantum technology! So, the project Kelvin Blockchain are going to change the current provisions of the crypto world, thereby secure their funds from quantum threats.