It won because it was the first, but also because it’s API was designed to be cloned. Being cloned was a success criteria for the the S3 team. I read that some

It won because it was the first, but also because it’s API was designed to be cloned. Being cloned was a success criteria for the the S3 team. I read that somewhere recently. I don’t have a source to hand. Personally I this the API is ok, but if they did designer it to be cloned, they could have done it slightly better.