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iFixit Tears Down McDonald's McFlurry Machine, Petitions Government for Right to Hack Them
(www.404media.co)
This is a most excellent place for technology news and articles.
There's literally no other explanation, McDonald's can only do whatever brings them profit, and they did the math I'm sure, this HAS to be profitable.
No. I already gave another more probable explanation that happens all the time in business.