Why should the RIAA bother to browse your host, when your host constantly keeps advertising its shares. - There just has to be a RIAA spy node in the neighborhood and they'll have 90% of your shares within less than an hour without even bothering to connect to you directly.

If they connected to you directly somebody would soon become aware of the RIAA servers constantly trying to browse hosts and you could block them very easily.

If the single purpose of such an option was to keep the RIAA from scanning your host, it'd be pointless to implement it.