2018 was the year of the exchanges, they earn BIG profit even in the pump & dump stages, so it was understandable that building a crypto exchange became the trend & scam way, they did not even publish the founding team information. These new tiny exchanges issue tokens (ICO), collect listing fees, don't check projects, or create a scam project and promote them. I think some big exchanges like Binance, Houbi, Coinbase, Remitano are enough for the community to trust and use.