It's mostly about paying for the bandwidth, not the information itself. In the client-server model, the the server owner has to pay for bandwidth and operation

It's mostly about paying for the bandwidth, not the information itself. In the client-server model, the the server owner has to pay for bandwidth and operation costs, which is the justification for advertisements and such. Even in torrents you have private trackers and all of these annoying incentive systems for people to host content. If you had a good reward system on top of bittorrent/IPFS I think that idea could take over the world, but it is not efficient or decentralized to do so.