What if the restaurant already knows your favorite choices? It will never happen that it is sold out.
lsretail.com - How internet-of-things could give flavor to your ice cream
Why should a customer submit own preferences? A customer wants to have purchase success, quick and efficient. And even if customers don't like to share their attitudes, it is collected anyhow.
See also:
forbes.com - Coca cola uses big-data to evaluate flavour preferences
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