That's a really cool application of Blender! I'm also using Blender headless in docker containers on Google Cloud, though not using Cloud Run. I'm doing it for self-service molecular visualizations -- "create your own molecule video". It's at https://bioviz-studio.com. But I run up to 50 dual-T4 instances for speed (Cycles X helps a lot!). And I agree the python API is a bit weird, and hard to use, but once you get the hang of it you can create really complex and interesting scenes just using python.