The killer app for Freenet is information that some powerful entity wants to censor, but whose popularity the Streisand Effect can thwart.
Such a capability is needed for true social good extremely rarely, perhaps whistleblowing. Usually other mechanisms for censorship-resistant publishing suffice: Tor, Bittorrent. Freenet has yet to be critically needed, to my knowledge.
However, Freenet may still serve a purpose as a threat rather than execution (actual use). Attempts to censor other channels will only increase its popularity.
In the meantime, while not yet needed for true social good, it still needs to be developed and tested and deployed. Therefore, perhaps we should laud rather than decry its currently inane uses (primarily entertainment).