I had a barebones, "always free" instance set up in Oracle Cloud, and now it seems to be gone. I've seen other related questions, but any answers in that case seem to refer to instances left inactive for long periods of time. In my case, however, the time between when I last used it and when I noticed it was missing was 5-6 hours at most.
My free trial ended 3 days ago, but I wouldn't have thought I'd have been able to access it earlier today if that were the issue here.
Edit: resolved