I have read discussions about NodeBB on The Admin Zone, Discourse forums and all over the web. At this stage of product life cycle you should not be worried about them. You can learn a lot from their comments as many of post authors are experienced forum admins and software developers.
Hard to install? Relative. Around year 2000 we used Ikonboard (Perl) and it was not easy to install nor configure. When you like forum software look and feel plus its features you'll learn fast how to use is no matter how hard it is.
Nothing wrong when you ask about license terms and conditions. If you see an error on Wikipedia or similar websites with content written collaboratively by volunteers just register and change it. I have done this before on Wikipedia and their software Comparisons.