Moving the goalposts, but the decline button in your example looks significantly harder to engage than the join button, and engaging with it would cause at least a twinge of anxiety in anticipation of having to essentially coerce the interface to accept that I do not wish to travel the gilded path.

It frustrates me that this sort of design has become not just acceptable but celebrated as 'correct', and I long for the days when interfaces did their best to seek my enthusiastic consent to my chosen course of action.