I only have a similar observation that generalizes this. How come these old established giga corporations don't diversify/branch into these seemingly profitable

I only have a similar observation that generalizes this. How come these old established giga corporations don't diversify/branch into these seemingly profitable niches? Counterfactually we can say that those who did overextend too much died out. Those who are not focused can rarely do well enough to truly cash in on a market. (Is Samsung a good example of this or a good counter-example? Or simply a strange outlier?)