> Now if you are feeling very magnanimous, you could argue that the editor is a freemium tool, and that added links are how you pay for the free version.
Well, unfortunately this is basically how every freemium tool works. They have some way of advertising, in exchange for free use of the tool.
Even reputable CMS tools like WordPress include back links to wordpress on a new site and themes.
Although, this is much less common with open-source free tools, as the community resists these kinds of changes.
No such thing as a free lunch!