The problem you run into with Hulu is that the service doesn't get the exclusives of other subscriptions and doesn't get new anime as quickly as Crunchyroll, Funimation, and Hidive.
Offering multiple viewing options, it caters to the varying needs of different viewer types.
When it comes to anime, Netflix aims for an older audience--for example, Aggretsuko addresses sexism in the workplace, Devilman Crybaby includes hardcore depictions of violence and all-out nudity, and Violet Evergarden is all about coping with grief.