Social and Promotional email filtering

What happen to the Social and Promotional built in email filters, which filters these kinds of emails into separate mailboxes?

This was working beautifully for my parent’s email accounts but I’ve just noticed these filters seemed to have stopped working in Sep 2020. Settings appear to be removed too.

It seems this feature was removed unfortunately.

I’m thinking to move email hosting to Google Mail to get these features back for my parents. Presumably I’ll be able to set up hosting using a custom domain + SMTP and manage their filters for them without them needing to visit Google at all, right?

Unless something has changed (I setup Google Workspaces some years ago), the web interface is on mail.google.com. You can setup a custom URL (e.g. mail.example.com), but that will just redirect to mail.google.com.