Plenty of reddit ads get past the pi-hole when I view with a browser of any kind, I assume those same ads will make it into the app. As a sibling commenter said

Plenty of reddit ads get past the pi-hole when I view with a browser of any kind, I assume those same ads will make it into the app. As a sibling commenter said, if it's coming from reddits domain, a pi-hole won't do much to stop it.