The private network is only as good as the weakest link which has to offer a reason for people to go through the trouble of accessing either by paying money or

The private network is only as good as the weakest link which has to offer a reason for people to go through the trouble of accessing either by paying money or other means (acquiring special equipment). And by putting a wall up you end up losing a large portion of the market to those that will now simply arbitrage and fill the space you leave behind. There is simply no way to stop crawlers/scrapers, period, unless you put a meter on it or go offline.