@PitaJ Thanks, it is actually not the issue of NodeBB, it is the decision on which strategy to choose. Anyway, I've done no worse than before, that is enough.
Test the out image links:
Quick question... how can I enable anonymous replies? is it a good practice? and, if it's possible to do so, can I include a captcha to avoid massive spam?
You can enable guest replies in the ACP. I don't think it's possible at the moment to have a captcha but you can enable post backlogging for users of less than 1 reputation and that should catch them and put them in the queue.
Guest replies is a little different than anonymous replies. The point is that only registered users can use anonymous replies. But anyone can Guest reply. I do hope there is an anonymous reply feature in the ACP.