Hoo boy, the first Gateway book really stuck with me. It really hit me when the protagonist explained their suffering. Even if it's decades later for you, how can you get over something or forgive yourself for it if, for them, it's still happening. “She's thinking I betrayed her, and she's thinking it now!"
This happened to me too, earlier in the year. Fortunately I wasn't doing anything important with the single instance in my account. It was comically impossible to find any information about what had happened. And then a few weeks later, the account re-activated - again, without explanation.
I don't think you unknowingly violated some ToS. The best I could figure, there's a periodic automated internal process that accidentally sets some accounts to an invalid state. Accounts with paid support can complain and get fixed manually. The rest of us need to just wait for some other automated sweep to come along and fix all the broken accounts.
Needless to say, I wouldn't use OCI free tier for any kind of production workload. And I'm not sure I'd trust that this type of issue is limited to free tier accounts. It seems like stuff in OCI... just breaks sometimes.
