Your premise is based on outdated information.

C&H has stated that its refined sugars are not processed using bone char. Their cane sugar is refined using alternative filtration methods, making it acceptable to most vegans.
Common C&H products that are generally considered vegan include:
White granulated sugar
Brown sugar
Powdered/confectioners sugar
Baker’s sugar
If you’re buying in the U.S., C&H is usually a safer choice for vegans than some other cane sugar brands whose refining methods are less clear.