What messaging systems are similar?
Messaging systems that also implement or strongly align to the “publish-subscribe” model include AWS SNS (Simple Notification Service), Google Cloud Pub/Sub, Redis' PUBLISH-SUBSCRIBE features, and RabbitMQ. If you have used one of these systems before, you will notice that Pub/Sub shares similar foundations (topics, subscriptions, fan-in/fan-out models) and is easy to migrate to.
How is Pub/Sub priced?
Cloudflare is still exploring pricing models for Pub/Sub and will share more with developers prior to GA. Users will be given prior notice and will require beta users to explicitly opt-in.