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Academic papers yanked after authors found to have used unlicensed software
(go.theregister.com)
This is a most excellent place for technology news and articles.
Yup, wide use creates a lock-in effect. If your software is used by everyone, paid or otherwise, it's the standard and you will never run out of paid users. This is why CAD companies offer free tiers and why student subscriptions are always heavily discounted.