The reason I stopped donating to them back in the early ‘90’s.
In 1989 I got almost all of my department to participate. The only other department with a higher rate was personnel (4 people, big whoop).
My method “Give them a buck, get them off your back.” Make the lowest possible donation, one time only, and then you won’t have them nagging you.
It worked - and the UW for a whole $25-$30 buck (More than they deserved), but they had to report that my department (Maintenance, you know, the lowest of the low) got a higher % donation rate than the big time mucky-mucks. Yes, I had a good laugh over that.
Companies get big accolades from employees “contributions”. In my experienced, forced contributions.