How many brokers for classic assets are out there? Thousands, why? Well, just like everything else, why are there a ton of different websites to buy the same things? To sell the same things? etc etc. That's how it works, ultimately the ones who are serious about it will try to offers something better, whether it's regulations, better fees, faster platform, more detailed charts, more trading options, margin trading, etc etc. We do in fact need more cryptocurrency exchanges, hopefully decentralized ones as well.