Every person's profit would have been somebody else's loss. They match exactly, less transaction costs which were saved by both sides. Of course somebody else didn't collect on the transaction costs.
The exchange obviously does not get to collect transaction fees for transactions it fails to mediate. But that does not harm buyers or sellers. As noted, they get a vacation from paying fees, along with avoiding any profits and losses.
The exchange suffers, paying salaries and rent without income, but they deserve it for providing crappy service.
