Once approved, we will provide credits for the data being migrated. We don’t require you to close your account or change your relationship with AWS in any way. You’re welcome to come back at any time. We will, of course, apply additional scrutiny if the same AWS account applies multiple times for free DTO.
So if you're going to do this for that one time you have to, probably not a big deal.
But if I were you, I'd be prepared to egress, kill the account, and then create a new account.