The quota we needed increased far beyond the usual was the YouTube API. The startup was a media editing and publishing tool, with a feature to upload videos to YouTube on your behalf. Uploading a video requires a ton of quota, which they gave us.
Regardless, dropping all quotas to 0 effectively killed our GCP account.
How many services have meaningful SLAs for extreme downtime?
Github and (parts of) AWS will give you a small discount at 0.1% downtime, a bigger discount at 1% downtime, and AWS will refund the whole month for 5% downtime. But beyond that they don't care. If a particular customer gets no service at all then their entire $0 gets refunded and that's it.
If you werent willing to pay for an SLA, and they clearly werent going to offer one to you… why is it surprising if literally no promises were made in writing?
Why would they intentionally lose money on your private commercial activity without even that?
Regardless, dropping all quotas to 0 effectively killed our GCP account.