The problem with external audits of egress is that the code can be modified to do not throttle known auditors.
Even if we implement Distribute audits across storagenodes, it doesn’t help much - the software can be trained, which IPs/NodeIDs are auditors.
It also just a random value depending on auditors’ location, so it look like useless, but requires an additional dev efforts for nothing. The economic works better than that.