This has been true for years already though - why would anyone use confluent over just running Kafka themselves, or self host sentry, elasticsearch, gitlab, mongo, databricks or grafana?
Now, these supporting services can quickly become more expensive than the cost of a subscription to a powerful coding agent. You can get a beefy server on Hetzner for less than $50/month, self-host all of that and run entirely on open source alternatives. This is on the same order of magnitude as the cost of your LLM subscription. You can (theoretically) have your whole IT operations costing you a few hundred bucks per month.