> All of them work, but are prohibitively expensive to get started Firestore has a free tier: https://firebase.google.com/docs/firestore/quotas#free-quota http

> All of them work, but are prohibitively expensive to get started Firestore has a free tier: https://firebase.google.com/docs/firestore/quotas#free-quota https://firebase.google.com/docs/firestore/quotas#free-quota