This is a stupid claim.

FTX did get used to process crypto donations early on, because the Ukrainians setting it up needed an exchange to turn that crypto back into fiat for the Ukrainian government to spend.

That's completely different from claiming that US taxpayer funds got sent to FTX. And it's pretty obvious that the billions going to Ukraine are getting spent on war, because Ukraine is winning. Hell, so much of those billions are in the form of weapons, weapons that certainly are being used to great affect to kill Russian soldiers by the tens of thousands.