I don't have a technical solution to your question.
I would however point out a social solution to a similar problem:
the bittorrent protocol depends on people participating. Software was developed a few years ago (2008?) which would allow users to download without participating/contributing in any way. The developer of that program predicted the end of bittorrent within six months.
So there's hope. Not every abusable resource gets ruined.
Another example: people with open wifi routers would quickly put passwords on them if neighbours were really abusing them. The technology to really abuse an open router exists, but the problem hasn't exploded. Maybe meshes would also work despite the possibility for abuse.