Thank you for that; I would suggest putting that link in the PR description (or a comment) since not everyone who is similarly curious will be on a Show HN thread with the authoritative parties

I'm not trying to start trouble or get into a massive licensing thread on HN, but I want to point out that 2/5ths of those exemplar links of BSL success are in fact Apache 2.0 licensed, and not just source-available. I believe you that there are (evidently) parts of Kafka which one must pay money for, but my understanding is that the Apache Software Foundation would not tolerate hosting source-available projects on the apache.org domain nor in the apache GitHub organization.

I wish you all the best with your project