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Amazon Prime Video will start showing ads on January 29th unless you pay extra for ad-free
(www.theverge.com)
This is a most excellent place for technology news and articles.
It's not really free shipping. It's built into Amazon's astronomical fees. It's practically impossible to make sense of it, I had to use their fee calculator tool.
Their "most favoured nation policy" (meaning you can't sell your stuff cheaper than you sell on Amazon) should be flat out illegal.