Probably to the police. They can simply ask the police to hold an auction, the one that's held to unmark those Bitcoins that are marked as hacked, so either way, they'd still receive support from the money they got. That, or they can simply just surrender it to the police, though I'd prefer it honestly if it was the former. From hackers or not, a donation is still a donation after all. It's like blaming the currency for being used by hackers or something, which is plain stupid.
....They are acting like modern day crypto Robin Hood sending 0.88 BTC to both of the charities.
It looks like the hackers are only trolling or looking for fame. Although 0.88 BTC [$10,000] is a big amount to most, it's nothing to how much they have extorted from companies they attacked. They could have used a mixer too and not announce that they sent it to a charitable organization if they were serious.
A donation is still a donation imo, whether it be for the purpose of fame or fun. Let's be real, how many politicians actually donate out of the kindness of their hearts right? That's why it's probably stupid to judge a donation based on what the motives are, a donation is still a donation imo, which can still prove to be helpful for those that are in need.