As more tokens keep coming into the market, it is assumed that more cyptocurrency exchanges will raise. this, we all know have a risk effect which is that hackers are empowered to try their luck especially on vulnerable ones. The good side is that more tokens has the oportunity of getting listed on exchanges.
example; NCHT( nano healthcare) project just got listed on etherbase exchange.
You are right. That's why people need to more careful when they choose exchange to trade. everyday new crypto currencies are coming and that's why exchange are also increasing. if you want to avoid fraud then make sure exchange is good and trust able to trade.