Thanks, strange it is in the ToS.

For paid accounts:

- Network bandwidth: 1TB/month - Soft

- Storage: 1TB - Soft

- API requests: 500 requests/minute, 3 deploys/minute* - Hard

For free accounts:

- Network Bandwidth: 100GB/month - Soft

- Storage: 100GB - Soft

- API requests: 500 requests/minute, 3 deploys/minute* - Hard

I wonder if they do overages, or just a hard cut-off, no mention. They probably nudge users that go over soft limits to the enterprise column.