It is not opt-in by default for business users. The feature flag doesn't show in org policies and github states that it's not scoped to business users.

Gah - you’re right - but given that I don’t use personal copilot - but I do manage an organisation that gives copilot to some of our developers AND I was sent an email this evening making no mention at all of business copilot being excluded it could definitely have been communicated better…