You are right, there are numerous vector databases in the market. Most of them (including us) are still pretty early and a lot of enterprise readiness features to build. Including role based / privilege based access control, authN/Z integration, data versioning and backup / restore, fault tolerance, data streaming in/out, etc. We have first hand experience on the enterprise level product development and sales in our previous job at a series D graph database startup, and we will apply our learnings there to make Epsilla enterprise ready in the next few months
Because wrapping HNSW is just that easy. Same with all the ChatGPT-based tools popping around a dozen a week, it's just easy to throw something together and see if it sticks.