The YouTube Data API v3 gives each project 10,000 units per day. An upload operation costs 1,600 units. That means approximately 6 uploads per API project per day. Running 11 channels requires multiple API projects or intelligent quota management.
The Machine's Approach
The machine uses a separate API project per channel group. Each OAuth credential maps to its own project in Google Cloud Console. By distributing channels across projects, the effective daily quota scales linearly. 11 channels across 2 projects gives you 12 uploads per day of headroom.
What Happens When Quota Runs Out
When the machine detects a quota exceeded error (HTTP 403), it logs the channel as deferred and moves to the next one. After 6 hours -- when the quota window resets -- deferred channels are retried automatically. You never have to manually monitor quota status.