> Next best thing looks like the "object lock" feature on object store services that prevents deleting objects for a certain time.

Lol, no. "As of today we are closed. Goodbye."

Especially considering what giving even a two weeks now considered "generous".

This is for backups. The threat here is that random ware uses your backup script to delete/encrypt the backups too. With object lock the api key the script has can only add data.

The probability that the object store goes out of business at the exact time your own copy dies is insignificant.