It doesn't really make sense in my opinion, so maybe I'm the wrong person to answer, but I think it's a game of statistics. OF has captured a certain market, a

It doesn't really make sense in my opinion, so maybe I'm the wrong person to answer, but I think it's a game of statistics. OF has captured a certain market, and is making a certain amount of money. Of companies like that, a small but not insignificant number grows to super major size, the size that can do an IPO and exit for billions. The current owners are OF are trying to capitalize on the value investors put on that possibility, and on the reduced risk of having so much money invested. With each investment round the risk of failure goes down a little, and the risk of major success goes up a little. A major example of this is Facebook. It was profitable and well established, why would they need extra investment or an IPO? Then out of nowhere Facebook bought Instagram, and Whatsapp, and it is clear now that without those two acquisitions Facebook could have been in serious trouble. The absolute crapton of cash they got effectively took away risk. So it's a chance to de-risk and cash out of OF, and let the big boys play on taking OF to an IPO.