Error Quota ‘C2_CPUS’ exceeded. Limit: 0.0 in region us-central1

I can't take full credit for this answer - I just remembered this one - but a deployment to Google's cloud leaves the old deployment in place (and thus using an IP and your hard-earned money) indefinitely.

Deployments can be triggered with --stop-previous-version to prevent this behavior, and you can use list and stop to find and remove the old deployments so they no longer use resources.

To summarize and add documentation to the existing answer and its respective comments:

GPUs are not included in the ‘Always Free’ GCP resources as explained by the following documentation.

If you’re using the ‘12-month, $300 free trial’, you can find on the 'Program coverage' row of the table pointed by this link that it is not possible to add GPUs to Compute Engine instances.

In this documentation, you can find the GPU models that are available for both compute and graphics workloads as well as the zones in which they’re available.

For their respective pricing you can find information here.

For more background on GPU quotas and how to request their increase, refer to this section of the Compute Engine documentation.