I should tell you to just google it, but you're also right. Lots of stuff that ends up on HN is actually really opaque about what the hell it actually is. See also, this item currently near the top: https://news.ycombinator.com/item?id=7669449
Thanks for posting this! I know I can just google it, but since the link from this item does absolutely nothing to just say what the hell Tails actually is, I probably wouldn't have bothered. Glad you posted this because it's actually good stuff to know about!
If he cared that much, then why would he leave? A captain should go down with his ship. Here's a guy who made a boatload of money, and now he's leaving 4,000 employees behind who are probably going to be looking for new jobs inside of a year. He should take it personally.