Yahoo is in the business of running fantasy football: a service which adds up points and tell you whose team wins.
Draft Kings is in the business of running a fantasy-inspired gambling scheme: people pay them money, and some fraction returns to the guy with the most fantasy points.
Market share isn't comparable here; only one of these is an actual profit center. (I have no strong opinions on the viability of DraftKings/FanDuel, but they are plausible moneymakers on their own, Yahoo or ESPN fantasy aren't, other than as a source of ad eyeballs.)
Draft Kings is in the business of running a fantasy-inspired gambling scheme: people pay them money, and some fraction returns to the guy with the most fantasy points.
Market share isn't comparable here; only one of these is an actual profit center. (I have no strong opinions on the viability of DraftKings/FanDuel, but they are plausible moneymakers on their own, Yahoo or ESPN fantasy aren't, other than as a source of ad eyeballs.)