Maybe one day i will have a working wallet so i can give back the IOTA to some people. But no, i can't, because i need other people node's IP. To bad people share that on Slack.
If you'd like to give the iotas back, I'll share my IP with you here and so will some others.
Else if you want nothing to do with it anymore you could give the seeds to a trusted member and tell him where to send how many iotas.