Looking at classic game shows, several hosts used these. Searching “game show microphone” actually brings up a variety of examples.

It makes a lot of sense when you realize that they need to capture the sound of contestants and they are also moving around a lot. There’s no way to use fixed mics all the time. Obviously not everyone is provided with a wearable microphone.

And the shorter the microphone is, the more the host has to exert himself by holding his arm up near contestant faces.

A long lightweight microphone is the perfect solution.

Also keeps the host’s hand/arm out of close-up shots of the contestants talking.