You are a little wrong. They also accept all tokens on Ethereum (ou tokens ERC20)
This is indicated in the list. It turns out they take thousands of currencies and believe in their future)
Accepting donations in a currency =/= believing in its future. I would call it a stretch to say that UNICEF "believes in the future" of all ERC20 tokens when the vast majority of them are trash.
I mean, I doubt they'd go through the trouble of accepting these things if they thought there was no future in them. There's no reason to go through the trouble of accepting cryptocurrency if you think it's a fad that will die in a year or two.