This is really sad. even all those exchange that naturally people will think they are very transparent and fair. all this make me even begin to think there maybe more to this in term of shady business these numerous exchanges might be into. money laundering etc.
The amount of regulation in the market of cryptocurrencies is low and it is likely that is going to remain that way for a long time because exchanges are going to try to avoid to establish themselves in countries which have very heavy regulations against them, so while we do not have proof about the wrongdoings of exchanges it is quite likely that some of them are committing some illegal activities.