Well, I mean, I remember when Cory Doctorow first created the word, and it's always meant to me what the sidebar says. It captured specifically why online platforms start out very consumer-friendly to attract users, until the users and businesses are trapped by network effects, and they become the product being sold.
Maybe language changes, maybe it now means just "things getting worse" to some people. But I honestly think that's a tragedy, because if "enshittification" loses its specific meaning, it loses the power to specifically call attention to this phenomenon.
The specific meaning in the sidebar is explicitly about differentiating it from other generic capitalist decay. It's specific to online platforms, and in that specificity, is narrowly tailored and more relevant to what we experience in the 2020s.
That's the beauty of words - you don't need to reuse the same word for vastly different phenomenon, and by allowing words to have specific meanings, you increase the deftness with which we articulate and discuss the world.