Incorrect (manual service instantiation):

// app/components/user-profile.gjs
import Component from '@glimmer/component';
import ApiService from '../services/api';

class UserProfile extends Component {
  // ❌ Creates orphaned instance without owner
  api = new ApiService();

  async loadUser() {
    // Won't have access to other services or owner features
    return this.api.fetch('/user/me');
  }

  <template>
    <div>{{@user.name}}</div>
  </template>
}