Using the word ‘revert’ to describe converts to a religion of any kind is a form of cheap intellectual deceit.
The tendency among some Sunnis is to use the word “revert” to describe converts to their religion.
The unsubtle implication is, of course, that Sunni Islam is the pre-existing and universal faith from which some have latterly diverged.
This is predicated, somewhat predictably, upon a ḥadīth (that very literature which has served to preclude many Sunnis from doing due diligence on what the Qur’an’s usage of the word muslīm implies).
Original video: https://www.youtube.com/watch?v=Yg7lt79b5Lk