As I see it, it's a module. Thanks for the answers, not helping much anyway. https://www.drupal.org/support → as I can see points kinda towards the "issues" section or paying for your CMS setup to unknown companies. https://drupal.stackexchange.com/ - can't understand the point of the existing drupal.org then. Really messed up tbh. I guess the only option will be the other CMS, which can provide help within their website, not third-party like StackExchange, and is more newbie-friendly. Note to me - not all that glitters is gold.
The problem is, that now the same Open Social won't work properly. Can't turn on any of the module features. I only get the message that some files already exist, blah blah. And that's on a freshly installed Drupal. How's that possible?