Well, yes, good ISPs do just that, sure, I guess my point is that anything else should just outright be rejected as obviously unacceptable, and it should thus b

Well, yes, good ISPs do just that, sure, I guess my point is that anything else should just outright be rejected as obviously unacceptable, and it should thus be the legal responsibility of all ISPs and thus breach of contract if customers do actually notice that the network is oversold.