I agree with you, as mentioned in the article, I’ve built similar solutions as yours at Algolia, using Redis and Kubernetes. However, not all developers know and want to do Kubernetes or RabbitMQ and not all companies can afford to invest time to set up and manage it (https://docs.bullmq.io/guide/going-to-production).

We address privacy by encrypting all the data on our side (doing a second pass with a symmetric PGP key for tokens such as GH tokens, and environment variables) and advise companies that want to keep their data on their infra to push as minimum data in arguments while leveraging a dedicated SSH tunneling setup between our infra and theirs.

When it comes to the SLA/up-time of home grown, my POV would be that, again, achieving good results on those often requires SRE engineers, which is an investment.