Thanks again to @RGJ to take the time to debug and think trough the issue with me, helping me to spot my configuration error in using the everyone group. As in my installation only logged in users have access to discourse contents, I initially failed to understand the difference between everyone and trust_level_0 – but now learned, that Discourse handles these quite differently. So no issue with the plugin, and even more thankful for the added warning, as I fear, I would have fallend in that trap sooner or later again… 
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