The sudden growth rate in sales derive some people to capitalize on it. Mostly either Chinese manufacturers or drop shippers though sometimes big names get swept up in the frenzy too. Then the market is flooded and it's not cool or unique anymore, or the target audience is saturated and then it's forgotten. I suspect something similar is happening now with screenless fitness trackers right now (even though I bought one because I hate smartwatches but want a fitness tracker)
It's especially funny seeing people who are into "MP3 players for digital detox" speak on podcasts or online. "I love that it's not a phone. I just wish it had <insert random ass app(s)> so I can take it on walks and leave my phone behind" then those random apps are different per person. It's really funny.
Similar thing with the screenless fitness trackers I mentioned. On every single review or discussion board for them, you will find people complaining that a screenless fitness tracker is, in fact, screenless and that they wish it just had a small screen for their important notifications or if it can answer calls or get phone notifications or connect to LTE.
Music is cheaper than it's ever been for the consumer and segregation between genres or bands is non-existent on music streaming.
It's hard to socially signal when everyone can afford to stream and the search bar can show you Sabrina Carpenter just as easily as RYM or /mu/core.
However , you can socially signal if you spend money on an iPod, DAP, better headphones, physical media etc.