No I don’t. What’s your point?
Currently there is a plan to use percentage (5 or 10, can’t remember right now) of the SafeCoin supply to reward uploaders of popular public data. A wallet address of the uploader is stored (with the datamap I assume). For every GET of that data, there is a (very) small chance that the uploader will be rewarded by the network with some SafeCoins. Caching should make exploiting (GETting it again and again yourself) impossible.
David Irvine initially wanted to make public uploading free for ideological reasons. Others were concerned about a potential tragedy of the commons situation, so, as far as I know, the 25% was a compromise. The 25% is mentioned here.