The YouTube thing is real, my timeline has been flooded with the kinds of examples seen in this thread. There's a category of YouTube content creator that wants to make a living off of it, or at least start seeing the money come in, and for those folks who take it "serious" they also tend to pay close attention to trends and videos that do good numbers, then make their own version of it in an attempt to get in on the game. YouTube itself makes these sorts of content recommendations based on algorithm, so you see floods of the same kind of videos being made. Some of these folks also sign up for app-style marketing help that does the recommendation work for them. Some just see what's on their front page and mimic it.
Overall, it's low to medium quality content, but it gets the views, so it works, and it works well. The topic of "are CDs popular again" is easy content, really, and seems to get watched, so it gets made.
I think we are seeing a slight increase in the price of CDs due to mild increased demand and maybe a decade of people throwing out their CDs, so while supply is still plenty big it is starting to be a bit less so as demand is on the (mild) rise.