ProPublica asks readers who have used sports betting apps like FanDuel and DraftKings to submit their app data, aiming for at least 250 uploads, to study how the apps incentivize play and when they urge users to slow down. It says the files go only to its newsroom, notes users have reported the companies taking more than 30 days to provide data directly, and offers three submission methods, including a browser extension, taking 5 to 10 minutes.