What do you find tricky?

Of course these decisions make sense for the business making them. That does not make it less unethical nor does it change the fact that what these decisions are doing is in fact making products/services worse and in turn making the world a worse place.

Who says that these decisions don't make financial sense for the companies making them?

Why don't these mistakes happen while companies are establishing themselves? Enshittification is often a kind of monopoly abuse, and it doesn't accidentally happen before the monopoly has been established.