Before the enshittification you know today, there was Flash, everywhere, whether the page needed it or not. Tech debt, scope-creep, and feature removal, are drivers of enshittification, not-at-all outside of its definition or unrelated to it, particularly where they drive forced-obselecence and unnecessary up-grade cycles, aka consumerism.
It doesn't have to be intentional to be enshittification. Laziness and group-think will suffice.