WordPress contributors are discussing different strategies for responding to Facebook and Instagram dropping unauthenticated oEmbed support on October 24. WordPress will be removing both Facebook and Instagram as oEmbed providers. When a user attempts to embed content by pasting a URL as they have in the past, they may not understand why it no longer works. They may assume that WordPress broke embeds, causing an increase in the support burden for this change.
A few participants on the trac ticket for this issue have suggested WordPress detect users who will be impacted and attempt to warn them with a notice.