1. Fully connected networks; you will be able to host anything in a network(for free) and have it up 24/7 even though your computer contributes just 2 irregular hours of hosting to other nodes in the network.
2. Anonymous networks; suddenly your product becomes popular but you have no idea how many people have seem the ad, where they saw it and even who made the ad in the first place.
3. Remixed content; this one already dominates the internet but will become even more widespread as the internet becomes anonymous and hosting becomes free(in all senses of the word).
A consequence of anonymous networks: art with embedded ads, also already a reality, will become even more widespread.