Buy all BTC? I think that's impossible, though Amazon is rich, buy BTC isn't good solutions.
If all BTC have been paid by Amazon, that's meaning nobody have/hold bitcoin in their wallet anymore, my question : how amazon can accept payment by bitcoin while all bitcoin in amazon wallet? Bitcoin can't circulated if like that
Or you not mean ask like that? if yes, you can edit your post to make it more clear question. thank you