oracle
I discovered recently that Oracle Cloud has 4-core arm64 instances in their free tier. So I signed up for an account and set out to get an instance for myself. However, the instance creation failed stating that my chosen region did not have any capacity left for additional instances. A little bit of googling turned up this: https://www.reddit.com/r/oraclecloud/comments/on2e25/resolving_oracle_cloud_out_of_capacity_issue_and/. I didn’t read the linked article (which is apparently paywalled) but the poster had apparently posted a script that would attempt to acquire an instance in a loop until the attempt succeeded.