He was only behind Soros in terms of total dollars to Dems.
His mother started a couple of Dem PACs just 13 days before her son became CEO of FTX (imagine the coincidence!). Her money, as far as it is traceable is also very significant.
... This was I suppose part of his "effective altruism" (if you can say that with a straight face). Instead of downvotes, imagine the comments and rage if he had donated to Trump instead.