First, I have watched several. I regret it. It's a confession.
A number of things hit me. One, is what an incredible waste of time type of video to watch. What do I care about their hearing song?
Two, a lot of it does seem at least plausibly phony. When people do dozens of such videos, it raises questions about whether it's really 'first time', how much it's an 'act', and so on.
Three, there is this one sort of creepy couple that does them. If you've seen them you probably know who I mean.
Four, it seems like an incredibly 'cheap', and I don't mean in the financial sense though it's also cheap financially, type of entertainment. Go watch the quality research from Simon on the 'Today I found out' channel, and all these guys have to do is listen to a song?
Five, if you DO want to watch something like this, there are also videos - not great, but - of claimed 'experts' like a drum teacher or a voice coach, who react to songs. But for example, the voice coach doesn't seem to add a lot except to praise the singing a bit.
Six, the people I see do the videos, aren't really people whose reactions I'd especially want to watch.
I'm not sure what I was attracted to. There is something that draws you to watch someone react to a song you like for the first time, but I found it wore off quickly. Good, they heard the sound and liked it. I'd rather just hear the song.