The ladder is perfectly fine for getting on rooftops, as it is working as intended. It's not a bug or an exploit to get on the rooftops via the ladder. The drone however, is a bug/glitch that is being abused and exploited to reach positions that are inaccessible and get an unfair advantage.
Per EA's own Terms of Service, THEIR OWN RULES, “When you access or use an EA Service, you agree that you will not … Use or distribute unauthorized software programs or tools (such as “auto”, “macro”, hack or cheat software), or use exploits, bugs or problems in an EA Service to gain unfair advantage".
My question to ANYONE at EA is this. Are you going to enforce your own rules? Because if not, then you are condoning and endorsing players breaking them. There is no grey area here, it is black and white.