As always with crypto, this “use case” falls apart on even the tiniest inspection.

Ukraine was not cut off from the global financial system and had no issue receiving donations in fiat currency—I myself sent them some fiat. It was quick and it was easy and the Ukrainians lost a hell of a lot less of my donation to transaction fees than they did of the ETH.

Donating to Ukraine in ETH is a higher-fee way to do something you can already do (this is typical of purported blockchain “use cases”). If you actually care about the recipient of the donation, you should want as little of the donation to be siphoned off as transaction fees as possible.