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Ideally after first ticket support could flag their account as needing manual review for suspension

This seems like the easiest fix.

But it adds a human interaction and that costs money so… no! Suspend.

Sounds like they do have human interaction already, since the suspended emails need to email customer support to get unsuspended.

At a guess that makes the account a net loss for Google.

Their support reps would have to be paid thousands per hour for that to be the possible reason