discourse/app/assets/javascripts/discourse/routes/restricted-user.js.es6

import DiscourseRoute from 'discourse/routes/discourse';

// A base route that allows us to redirect when access is restricted
export default DiscourseRoute.extend({

  afterModel() {
    if (!this.modelFor('user').get('can_edit')) {
      this.replaceWith('userActivity');
    }
  }

});