When I tried it last year, their edge compute infra was just not there yet. It could not do any meaningful server-side rendering because of code size, compute and JS standard constraints.

Has this situation changed?

Depending on your precise requirements, I think it might have changed.

I've been trying out Bunny recently and it looks like a very viable replacement for most things I currently do with Cloudflare. This new database fills one of the major gaps.

Their edge scripting is based on Deno, and I think is pretty comparable to e.g. Vercel. They also have "magic containers", comparable to AWS ECS but (I think) much more convenient. It sounds from the docs like they run containers close to the edge, but I don't know if it's comparable to e.g. Lambda@Edge.

I haven’t tried to do SSR in bunny but they also have bunny magic containers now where you run an entire container instead of just edge scripts (but still at the edge).

Not sure what you mean with ssr for a CDN?