Suggestion: Adding a fallback authentication method with Recover Accounts Elsewhere

(This actually might just be a question of something I missed.) I see that “Adding a fallback authentication method with Recover Accounts Elsewhere” is with Facebook but Google and Microsoft accounts are both independently larger than Facebook. It is a wonder Facebook is even contending with them in the corporate world. Anyway, why is there no option for connecting a Google or Microsoft account? Or both? Is it that only Facebook’s API will work for this? It is also a security risk. If one account is breached then the other is too, no?