The level of negativity in these comments is surprising. We can certainly debate whether billionaires should exist at all, but given that they do, here’s one who’s putting his money towards advancing cutting edge science instead of buying a third mega yacht. I am strongly in favor.
I've been doing this for myself for a couple years now with a little service I wrote that just sends me an email each day that I reply to. It's archived in my email history and in a simple, searchable web UI. It's been super useful for figuring out when I did something a few years ago, medical notes, etc.