Perhaps start everyone off with a guest/sample account? I use Node w/ Express for my servers and in the ones that use logins I usually do something like this:

  app.use((req, res, next) => {
    req.user = req.user ||
               usersBySession[req.cookies.session] ||
               {
      logged_in: false,
      username: 'Guest'
    }
  }
  
  app.get('/api/getfeeds', (req, res) => {
    if (!req.user || !req.user.logged_in) {
      res.status(403).send(false);
      return;
    }
  }