True:( how can we determine that exchange is legit.. Asking your document? As their KYC,actually I scared sometimes to submit my credentials its because of scammers..
Better to check first their website and look for some feedback's to evaluate if their is no problem with the other traders. Mostly scam or fake site don't have that legit feedback and mostly are newly created exchanges. If that you are afraid of submitting KYC, better to look for another one but mostly that is required before we can do withdrawals and don't have a choice but to comply it.
at this moment much people trying to make fake exchanges.daily circulating money in cryptocurrency very big , and they take this opportunity as wicked plan.building fake exchanges and unable withdraw feature be their main action.