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by arunoda 4996 days ago
I think they don't mean to give it away free in the long run. They did it for redactor[1] too. (I think it is the full featured awesome and simple WYSIWYG editor)

It's totally upto the developer to decide upon on the licence. There are lot of projects under FREE, but not open sourced.

[1] - http://imperavi.com/redactor/