Email is boring, which is why people reuse it.
For Meta’s commerce and ads stack, that boring string is a spine. It ties Business Manager roles, payout profiles, domain verification, and support tickets.
When a consumer Instagram handle is disabled and you immediately promote a “new brand IG” from the same admin email family, you have not told a separation story. You have told a continuity story with a new skin.
If you are serious about compartmentalisation, email domains, recovery addresses, and billing identities need the same rigour as device swaps.
That is not paranoia — it is how large platforms reduce fraud rings. Your legitimate business can get swept into the same statistical bucket if the overlap pattern matches what abuse teams see every day.