At the time, walkmans were trending: people would use recording devices to record the song if it played via the radio or at a concert. You would know at least one friend who has a legit copy (vinyl or cassette) “borrowing” that for the purpose of pirating music, in which that finished recording is replayed on a walkman to listen.
The invdividual uses a voice recorder, the ones with cassettes to store audio but what could happen is that you can capture other audio cues irrelevant to the song (door opening or people speaking in the background). It’s kind of volatile in that sense, unless you are in a room that’s dead silent and soundproof capturing the audio.
I think most people were annoyed by the radio DJ talking through an intro/outro because of recording your own mixtape. I still hear some phantom DJs in songs even though the tapes have long been lost to time.
Weird thing, there are many songs in Brazil that have a “DJ <whatever>” mixed in the middle of the track. Not a radio DJ, just some rando that got the music, put his name there and shared around. Not something from the 80s, but from 2000 onwards, tho, still around today
Seems that narcissistic disorder is not limited to presidents…
That’s why they would do it. Some live DJs still do, even though radio taping is long gone.