Registering a 警備員 donguri account to email will never be required to post on 5ch.
Registering is only a benefit to users who have a difficulty retaining their 警備員 status due to changing IP addresses.
Of course, nobody is going to be required to register their 警備員 accounts.
It will only be offered as an option for those who want to use it.
I think the people who register their 警備員 accounts will be less likely to trigger the ARASHI ALERT system.