We discuss here the protocols and their inter dependence. But here we speculate about how DSR might infiltrate the world of Internet Protocol.

A prominent spammer has recently announced plans to become an ISP to avoid being evicted by the ISPs from which he has been plying his trade. Let me suggest a general behavioral meme that tends to defeat such people

pull the plug over which spam arrives at your site—whatever shape the plug.
You had best have multiple connections so that you can detach from which ever sends the most spam. Of course you stop paying the providers whose plug you have pulled.

This provides an incentive for them to pull the plug via which the spam arrived at their site. This may cascade until it reaches the source of the spam even if it calls itself an ISP.

The DSR connection

A less drastic action is to announce unilaterally that the link that the plug supports is henceforth under DSR control. If the sender wants the benefits of sending packets over the link they must pay you. You then become part of the problem and if the idea spreads you will be required to pay others. This would presumably spread until some ISPs refused to do business with such operators, or would pass the payments on to the end users.
Somewhere I recently read a note from a commercial establishment complaining that filters of some ISPs were killing their e-mail to customers. I have no idea if this establishment was spamming but there are some from whom I wish I could get reliable e-mail, such as a note from my bank telling me that my ATM bank card had been used. Legitimate traffic from an establishment can pay its way. I would pay 5 cents for each notice. If a big bank arranged with a big ISP to send mail with 5 cent postage and that such mail would not be filtered, I would get such e-mail but not spam. If some ISPs passed that 5 cents on to me I would be favorably disposed to them. I would expect the bank to charge me. The number of banks times the number of ISPs is cumbersome, but a forwarding business can reduce this contracting cost from the product of these numbers, to the sum.