Something people may not know is Opera the Browser is only a part of the bigger pie. Opera is an ad company (through Opera Mediaworks - they own Ad Colony, for example, that might not mean much to anyone not in the mobile apps/game space, but it's a huge player[0]).
It makes me wonder how much the purchase was about the browser vs. a solid play in the mobile gaming market ad space.
[0] http://techcrunch.com/2014/06/24/confirmed-opera-buys-adcolo...