Was it really funded by donations?
oh yes very much so. literally a GoFundMe. Leo is right, you should look into it, because it's very funny, but in a nutshell:
building a wall along massive stretches of border is unsurprisingly, extremely expensive - projected at well over $10 bn iirc
Congress did allocate some $ for it but only a (relatively) small portion of what was needed
Trump was been trying to wrangle all kinds of $ for it for years, including illegally diverting bns from defense budget
at the height of manufactured border hysteria - remember the "caravan"? - there were various crowdfunding efforts by MAGA types
Bannon + some cronies cashed in on that by setting up a wall GoFundMe and using donation to do yr typical embezzlement life of luxury things
it's extremely pedestrian fraud, and at the same time hilarious to see how cynical Bannon etc are about their own MAGA base
literal border wall profiteering