I'm guessing they break after a while and people buy a new one, then return the broken one. This is a bit pointless though as Amazon's guarantee is really good (in Europe at least).
A few years ago I got my wife an iPhone SE and after 1 and a half years it stopped working. I took it to an Apple repair center, and they said if I bought it there they would replace it - but as it was bought from another retailer I needed to return it to them. I contacted Amazon and they said as that model was no longer sold, they would refund the full amount I paid. Not bad.
I feel like this behaviour is in part a reaction to infinite growth and the accumulation of wealth these days. The divide is becoming so large that nobody can aspire to have the things that they want to have, which is all the more depressing for gen z knowing that previous generations have allowed trillionaires to exist, and the general political attitude from wannabe millionaires and billionaires is that everything is OK.