Garth Brooks is a brilliant musician and composer. Just because you don't like his style of music doesn't give you any rights to slander him and call him names, kiddo.
Garth has an exclusive arrangement with Walmart, which has its own online store.
This is a sad thing for his international fanbase (which may be larger than his US base) as it means his work is now unavailable to all of us living outside the United States.
The rights to the Beatles' music rest with Apple music, who just settled a major legal dispute with Apple computing a few months ago. I doubt they'll be available through iTunes any time soon.