As you mentioned, it’s trends. There’s nothing really sticky or mass-adoption like. This also isn’t necessarily new, as polaroids have been trending for over a decade now.
Most of the same kids still scroll instagram, listen on spotify and etc. At least that’s what I’m seeing around me.
Not sure why this comment is downvoted. As someone who regularly buys old stuff, the price goes up and down with trends that bare little resemblance to any “return to form”. It’s mostly people looking to turn a quick buck before they go onto some other trinket. We sit and wait it out, or wait for sellers who are not clued in on a given hype cycle.