I really don't think many people "choose" to bottlefeed.
I think some (very very few) try their damndest but are physically incapable.
I think many try their damndest, but without proper support (medical, social and familial), don't manage it. They're not helped by a lot of silly ideas, like the urgent need to put babies on schedules from the first week.
I think many think they ought to want to breastfeed, but deep down, don't want to, aren't comfortable with the idea, or whatever. (Life is complicated. Choices are complicated.) They try a bit, but not that hard, or maybe even sabotage their own efforts.
And I think a small number honestly decide they don't want to. And you know what? Their boobs, their choice.