If a Survivor D/C's on death hook, do you get cheated out of BP as the Killer? Should you report them for that or do you even need to report for that anymore?
You should normally get the 625 BPs for them DCing through the Quitter Bonus score event. Additionally, if they DC on a Hook, you'll still get the Sacrifice points (500 BPs for hooking them, 200 BPs for them reaching the first hook stage). These should make up for the sacrifice you would have gotten if they didn't DC.
Since they will still get penalized for DCing, there is no need to report them.