Achieve the ideal sound effect.
The anchor uses two microphones, because one is in use and the other is in standby.
Especially for those big anchors, two microphones are almost standard, because you never know when your microphone will go wrong. If something goes wrong, you don't have a spare replacement in the live broadcast room, which will make the scene very embarrassing. In order to avoid this situation, two are usually prepared.
The anchor has two microphones because he wants to adapt himself and become bigger, because many anchors sing some slow songs or speak in a low voice. If there is only one microphone, it may not be clear and the effect is not very good, so there may be two microphones in many cases, but it may not necessarily appear again.