Feels like there is a case to be made here that the decline of The Internet rather precisely fits those definitions, with the exception that it is a collective of those products and services undergoing enshittification, since high-quality internet-based products/services no longer exist in quantity.

Also see https://en.wikipedia.org/wiki/Enshittification#Impact which talks of the broadening of the usage of that term.

> high-quality internet-based products/services no longer exist in quantity.

asserted without evidence and likely false.