and why some accounts are able to sync obscene amounts of coins at a time on blockchain?
I saw this just before on blockchain Sync: bojanvirijant amount 252.4688857 MCZ on 2015-02-12 00:32:45 and another before that account folirant synced 7000 MCZ (!)but it was scrolled out by the spam syncs so i cant provide a screenshot, but these amounts dont seem right and if the centralized system is being exploited unnaturally by some users then something should be done about that as they are only going to dump their hacked/glitched/stolen coins on an exchange given a chance at which point a rollback becomes difficult if not impossible (it would mean possibly taking from the exchange/users who bought the coins).
This is one of the reasons we have turned off sending for now. We noticed this as well, and are trying to figure out what happened exactly.. For now we are suspecting someone used our first API to do this. We kept it around for some compatibilty issues, but it's deprecated now. The new API is MUCH more improved. We don't want to restore sending until we are 100% sure this won't happen again.