Had you been a paying customer before the change? Then it’s still available to you: New pricing FAQ for existing customers.
Could you please explain how oauth vs. email sign-in is connected to user visibility? I’m struggling to find the connection 
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User visibility is not the problem. Users’ email visibility is our primary concern. When we used oauth, we were able to fill the email field with something custom, so while it was something unique to each user, it was not a sensitive piece of information.
I am not the space owner, but when the change was made, our option went away.
Hiding the Email column on the users page for non-admins would also be a sufficient solution for us.
Got you, thanks.
Could you please share your workspace URL (XXX.fibery.io), either in DMs or via support? We’ll take a look at what happened. Maybe, a mistake occurred and we owe you the return of the functionality.