You're missing that they didn't exactly had to give that budget back to anyone. The copies were sold for money. People didn't give them money as charity, or investment, they got something they valued in return.They are not obliged to spend it all on production, and part of any crowdfunding budget goes to fulfill the backers' rewards. What they are obliged to do is to deliver on the campaign promises, and refund people if they have a problem (and even that is not that straightforward). Distribution costs of the game are basically free, so they made quite a lot just selling copies and perks that would mostly use a few hours of teams' time, not their financial resources.
If they didn't go over the budget, they already made it back.
If they did go over their budget (which might as well be the case), I want to know exact numbers before knowing how much they made and how commercially successful it was. If they spent twice the budget, then your comments are on-point, if less than 50%, they're in black already.