Algorithms do whatever humans program them to do, which can be delete, warn, email, slack, or call phones.
I think it's worth noting that algorithms like these are deployed specifically to take employees out of the loop, and adding a communications step would almost certainly pull them back in.
Potentially, though another consideration the algorithm implementers have is to make it difficult to "game" them. If it provides feedback, you make it easier for someone to figure out what will slip through and subvert the it.