Yes, you get the point... these exchanges are the "single point of failure". The "crypto community" have decentralized cryptos but these assets are "useless" if they can be captured by a single entity or only can be accessed thru a single point. Centralized entities always have at least one untrustworthy employee by the time and if no technological barrier is present than there you go... you will always have fraud. In this case maybe whole exchanges are compromised or untrustworthy - BUT we can never know from outside until a certain point. Maybe they are really struggle with technical difficulties in this case ...