[2021] Why can people with VAC ban still play DBD?

You are free to make suggestions to Steam themselves in their forum for Steam related things, as this relates to them and not us. The game uses EAC and not VAC - if you want to suggest Steam how to treat VAC banned accounts differently, the Dead by Daylight forums not the right place.

https://steamcommunity.com/discussions/forum/10/
https://steamcommunity.com/discussions/forum/9/