I guess it's personal opinion, but I find it understandable that business want to learn and improve from cancellations, hence why I don't mind spending a minute

I guess it's personal opinion, but I find it understandable that business want to learn and improve from cancellations, hence why I don't mind spending a minute letting them know why I'm taking an action. You're right though, users aren't obligated to give feedback. I don't like the de-emphasized buttons because they're essentially trying to trick me into clicking the more prominent buttons, which are actions I don't want to take at all.