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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.
Why is there some countries without thoses (e.g. Spain, France, Italy...) ?
Some regions/countries use a region/country-specific version of the app. Just a guess, but I would speculate that those countries that use a different app might also be using a different API implementation that hasn't been reverse engineered yet.
The way that site gets its data is they leverage the reverse-engineered ordering API that the app uses, and try to place an order for a McSundae and then wait to see if the online order is rejected (because the ice cream machine is down).