Ah yeah, I guess I just assumed it was static because every time I've been to a Bear blog it has been so light and snappy.
Just did a little looking. Micro.blog [0] is a true hosted static site offering; just hosted Hugo. There's also Publii [1], an open source cross-platform desktop static CMS that has one-click push to a variety of cloud CDNs (e.g. Netlify or Github Pages)