Materialize definitely looks interesting. I'd have a few questions regarding the current product:

Does Materialize provide a commercial non-cloud version where workers can run on multiple nodes in a cluster? On the website I only see references to the BSL-licensed single-node version and to the cloud version that is hosted at Materialize. Would a company be able to run Materialize on their own Kubernetes cluster?

Also is it possible to add custom code for data sources (for example Kafka, but with a different format than what Materialize currently expects) or is Materialize limited to the pre-defined sources?