Can you even imagine the scale needed to process this kind of data? That's petabytes (rough estimate), every day. Maybe, it's theoretically possible but any investment in this kind of technology would be enormous.
Browsing behaviour data maybe valuable but to what scale? Even a big advertising firm would balk at spending any big bucks for this and remember, the scale needed to mine any information out of this. How much valuable business insights can this generate that wasn't possible in the past?
Maybe I am wrong but I'd be very skeptical if selling is their master plan.