Are ddlc is a virus. If not i will download it. And how ddlc can know our privacy?

some games have like,some features that messes with ur pc,but that's part of the gameplay,like messing up ur window,changing ur wallpaper,spawning files that r for the story or sum like that (like imscared if i remember correctly)  but as i said,those are part of the gameplay,they're safe so yeah if u get like a windows pop up saying ''HOLY SHIT UR PC IS IN DANGER!!!!!'' ur pc is fine,its just the game,its safe as long its the true page thing and its trusted

I was wondering the same thing, but the comments helped me, thanks!