The facts are that large companies rarely innovate anything major. They tend to buy up smaller companies that have taken the risk and succeeded. Look at Google and Microsoft and tons of others. It’s a problem with growing big. The forces that make a company a successful scrappy little startup die out in the name of organizational efficiency. If you want to know what Apple innovated you have to look at what they did in the 70s or extend your criteria to companies they have bought.
The only things JSON has over xml is that it’s easier to write a parser for it and the format is less verbose and less complicated. There are extensions to JSON that can add features that xml has and the JSON spec doesn’t have. Overall the xml spec is bigger and has more features but that also makes it overkill for many of the cases that it would be used in.