Is it a business reason? Or perhaps the complexity of bitcoin accounting creating potential issues?
What do you think?
Could have several reasons.The negative image of Bitcoin for instance.Or maybe they are waiting for a scaling solution.
Another possibility is they just could create their own coin or accept one the planned bankcoins.Sooner or later we will know in which direction amazon will go.
When the Amazon accepts the bitcoin, there will be lots of transactions. 1 MB block size is not enough. This will cause bad user experience.