@shevek I think it's all falling into common sense application. If you really use and read the feeds its all ok.
For example, there is a user subscribed to 8000 feeds. That produces few hundred thousand news items per week. Its impossible for that user or anyone to read them So why have them. The other thing is that feeds that are read are removed form the server, but if you phisically cannot read through 200 000 feeds a week, they will stay and pile up.