Hi, We have a blog post discussing the license change here:
https://earthly.dev/blog/every-open-core-company-should-be-a...
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