I still think about my lost address that I obtained when Gmail was invite only. My family still occasionally CCs it and it drives me nuts, I would pay money to at least have it shutdown so they don’t think I received an email. I had email forwarding to another address when stolen and immediately after it was stolen it had the weirdest messages, I tried multiple ways reaching out to google and it still bugs me I was unsuccessful. I’d love the their of my account to at least have it shutdown
I got mine when it was invite only too, I had it a very long time.
I use protonmail now -- I think the "free" model enables providers to shrug and go "hey you don't pay us" (if there is support at all -- I've never been able to speak to a human about this issue)
Maybe you should send it enough mail to fill it up and the it would reject emails? Send a bunch of emails with large attachments and avoid getting marked as spam.