I thought it was dark as in manipulation that isn’t readily visible. For instance, a micro-transaction for a character reskin accompanied by default skins being crap. In Watchdogs Legion all the Londoners you could recruit generally had poor fashion, then money was scant and clothes were super expensive (but you could by more money with micro-transctions).
In one of the Space Quest series, as a joke (black humor in theme with the series) whenever an airlock interface was opened, the mouse cursor started on the Open Outer Door button, so an accidental double-tap was deadly, so dark patterns were known about in the 1990s, though not yet given a name.
Click-wrapped TOS and contracts for software and services were one such strategem, though we’re more aware of it today, and more judges are willing to reject contracts and TOS that didn’t include a clear, announced disclosure of their odious terms.