I believe that the "crapification of products" is just another manifestation of inflation, like shrinkflation.
That’s been going on forever too, but at least my hand-wavey perspective is that whereas I might have thought in the past “huh, I sense my Cadbury’s bar is possibly 2% lower quality than 2 years ago :shrug:”, now it’s more like “huh, I can’t be the only one who’s had to stop buying this crap which was previously an ace product”.
I suppose both these forms of inflation are down to consumer buying power being weakened, and posit that nowadays it’s due to the “stock price being the product” - to lean on a reference to Silicon Valley’s Action Jack :)