i think the confusion comes from the mixup between the words "database", "store", and "index". Vector "store" is trivial, even for hundreds of millions of vectors you are still in the realm of what is possible on a single disk. Vector "index" to enable efficient aNN is not trivial for large numbers of high-dimensional vectors, and this is usually the proposed value add of someone providing a vector "database", which combines the two. I think this is also how the words are understood more generally. This project is a wrapper over Cloudflare's infrastructure, which does provide a vector index, though it is not clear how well their index performs in real-world use cases.