Harambe is definitely a factor. But it's probably primarily related to the somewhat recent, self-deprecating meme of calling themselves "monkes"/apes (implying some acknowledgement that they are less "sophisticated" investors than traditional retail or institutional). I'm kind of glad to see this new meme because the older self-deprecating memes were pretty insensitive and made it easier to paint the crowd as malicious.

Well, meme-powered philanthropy is certainly better than meme-powered speculative investment.