If purse.io got hacked why use them at all, I wouldn't use a middle man to do a bitcoin transaction if I can pay for my goods directly.
They must charge a fee in order to run, like fold which you can use to make purchases at starbucks. Because if not, how could they be sustainable?
It was just a suggestion , Purse.io have a repuation since years now and no one is going to stop using it because a hack . most of the exchanges running today got hacked before and I don' t see people stopping use them . In fact , the number of users is increasing
All you need to know about their fees :
https://support.purse.io/general-questions/fee/