It’s the problem with their “always free” virtual machines. Use too much, and they delete it for abuse. Use just a little, and they delete it for inactivity.
Those aren’t free because Oracle is benevolent, but simply because probably they had a contract with Ampere to purchase millions of those arm server CPUs and they have vacancy
They’re “free” in the hope that they will catch a whale: someone gets used to their infrastructure with a test, then spin more paid virtual machines
If in a specific datacenter, suddenly a whale is asking more resources, the free ones are getting the cut
I wanted to try them but then I would have to register with Oracle… Yuck