SpacetimeDB looks interesting as a concept (the tech behind this server) but I could never sus out how could it would be in actual practice. I’ve always been interested in some post-mortems or reflections on the tech from other companies besides the founders
Personally I think they launched their 1.0 prematurely. The community seems a bit mired in constant rewriting and immature tooling. Because this setup owns your whole stack, when they having a breaking change it ripples through the whole thing and your on the hook for that as a consumer (prob more so if they control your hosting). Someday they might reach a stable state, but for now if you don't want to bleed for them, I’d be weary.
(I think there are technical and marketing reasons to be weary of as well, but the degree to which that matters is application specific. The above is universal and will probably continue to be the case through at least a few more major revisions if I had to guess).