So why aren't carriers deprioritizing/throttling/delaying inputs to their networks that are originating calls with anomalously low pickup rates? (And maybe th

So why aren't carriers deprioritizing/throttling/delaying inputs to their networks that are originating calls with anomalously low pickup rates? (And maybe that have implausibly diverse caller ID'S.) Sort of how email servers blacklist servers sending them spam except they dont have to cut them off, just eg add a second or two before they pass the call on..