I recently tried pikapods (https://www.pikapods.com/), they provide a pretty easy and stable way to run software like immich. The prices are reasonable as well, I’d say.

Have you looked into notmuch?

I looked into building something like this but I think most people are scared off because the TOS prohibit doing that, so I didn’t investigate further :/

Cool project, I’ve been looking for something like this!

Looks interesting! What are some of the things you use this for?