The purpose of shadow banning is to make it hard for violators to work around the restrictions. If the feedback loop is in the order of seconds, then the bad actor can quickly find a way to just pass the filter while still dumping the crap they want. The more cost each iteration incurs, the more the bad actor is deterred from doing that.
Of course, delaying the complaint and doing full shadow banning are still different things, and the former would suffice, but they chose the easy way out I guess, because their main objective is to keep the bad guys out.
Of course, delaying the complaint and doing full shadow banning are still different things, and the former would suffice, but they chose the easy way out I guess, because their main objective is to keep the bad guys out.