I’m assuming it’s a “soft removal” as the tech companies like to use: anyone still using it can stick around for a few years, but no new signups. (Have not actually checked.)
@edbobkov in the deleted topic wrote:
Note that Basic Display is not an authentication tool . Data returned by the API cannot be used to authenticate your app users or log them into your app. If your app uses API data to authenticate users, it will be rejected during App Review. If you need an authentication solution, use Facebook Login instead.
So it’s available only for business accounts owners.
“Rejected during App Review” sounds like “existing setups still work” to me.
Additionally, I’m going to bet that they’re going to wait until the pandemic is pretty much over before starting to pressure people to stop.