I think the “user is idle let’s poke the user” is a supposedly a “nice” user engagement to get users back on the system. I hear your concern.

I think at this point:

* opt out notifications before deactivate your account (go to account settings)

* deactivate and opt-out notification at the time of deactivation

* set facebook email as spam or something (although you’d miss any potential real security notifications.)

Or you can also remove your phone number and change the account’s email address. I own a dozen gmail accounts, one for mailing list, one for billing, one for personal, one for school, one for important tech accounts like digital ocean/aws, one for banks, one for general garabge I don’t care and so on. I also run a YouTube channel with a friend so I also own a separate gmail account to be added as a manager of the channel.

Much neater than labels (amazon emails can fuck me up easily, ugh).

I highly recommend this multi-email account approach. I can ignore 50 emails sitting in other accounts most of the time. All of them have second auth and some accounts have different passwords for additional security. Not hard to manage because the address format is always <A>.<purpose>@gmail.com. Consistency!!