As I don't own any coins and just stumbled upon this early June, I stopped investigating some days ago, but I got quite deep into the rabbit hole.
CMC now lists OFF tagged as "Inactive".
The chain is still moving, somebody is mining it, see https://chainz.cryptoid.info/off/
The latest source I got yields a daemon, but it won't connect to the addnodes I know.

My fear is that similar sudden attack-induced deaths could happen to other old coins, too.
Unfortunately, this has become quite easy due to services to easily rent hashes.
I thought of implementing a chain monitoring and protection solution that monitors the network, availability and changes in source, does anomaly detection in the blockchain and more. A job that is usually something the coin's dev and exchanges should do and cryptoid.info comes quite close at least for keeping public blockchain data.