I have watched many interviews and talk shows in English and in many of them, when the host is saying goodbye, they say
"I've been Xxxx Xxxxxx and this is The Talk Show X!"
Why do they say "I've been..." when they can perfectly say "I am..."? Is there a rule for this or is this just popular language?
An example of what I'm trying to say is this video by Tom Scott (I've copied the link on the time he is saying goodbye because the video is too long): https://youtu.be/3kgI-TZXCa8?t=920