Perhaps because it takes time to develop trust in the security of a network? (Which includes trust in the core software, the network and infrastructure, and the core devs.) How long has MaidSafe operated in the wild?

Perhaps because the market is already kindof satisfied with existing solutions? (Freenet, I2p.)

Perhaps because trustless opennet's are doomed by design? (This is why Freenet strongly encourages moving to a strictly darknet friend-to-friend model.)