Ukraine did bring in a lot of spammers and scammers to not just here but to everywhere in the world. Even twitter is filled with fake Ukraine "official" accounts that share donation addresses that goes to just directly their pockets, to people who have nothing to do with Ukraine. Even if we assume that OP is telling the truth, why give your money to him? Just donate it directly to Ukraine and if they want to use that to build something like this then they would, if they do not want to then they won't.
There are already plenty of different coins addresses that you can donate to directly to official Ukraine accounts, no need to help with OP at all.
Sadly yes it's true that lot of scammers are making money with that but that's not just for the Ukrainian government...it's a way to send money to our families that could convert to hrivnas in Ukraine and dollars, zlotys or euro abroad.... As a way to bypass the hrivna illiquidity.... We wanna do it locally in my city and if other cities wanna join us great, if not, it's okay, but if in my city works and people can use it would be just awesome...