This is a very useful add-on and as long as the module itself is free and GNU i see no problem with it being availble through this site, there are plenty of other add-ons which require you to have some sort of "subscription" for you to use them.
Also in this case the "author" is as far as i know not the service provider and he/she has also made, maintained and supported earlier versions of this same mod over a long periode of time and should be commended for doing so.
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