How about when the theming is baked in and impossible to change?
Enshittification doesn’t have to be monetary. It’s about doing things that go against the interests of the user.
Unfortunately Gnome has taken to heart St. Exupery’s law (“perfection is not when there’s nothing left to add, but when there’s nothing left to take away”) but have forgotten that it was coined in an era of mechanical devices and there’s more than one aspect to software. Applying it to functionality is very different from applying it to features and customization. The latter ends up making software feel bland and oppressive.