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The rule of growth
(i.imgur.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
To be fair, with a proper autoscaling scheme in place these services should scale down significantly when not in use.
That being said, a big reason for using AWS/GCP is all the additional services that are available on the platform.. If the workload being run isn't that complicated, the hyperscalers are probably overkill. Even DO or Linode would be a better option under those circumstances.