Malicious intent is absolutely a possibility but I think you'd be surprised at the amount of exchanges running off the regular consumer wallets (such as bitcoin

Malicious intent is absolutely a possibility but I think you'd be surprised at the amount of exchanges running off the regular consumer wallets (such as bitcoind and altcoin equivalents). These pieces of software are not meant to support the massive amount of transactions that exchanges see and do actually need quite a bit of maintenance to keep operating well. The industry is still in an infancy stage and the tools we are all using tends to reflect that more than anything.