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Our contributors mostly come from developing countries, and since law-enforcement agencies in some of those countries are corrupt, we designed our service to provide maximum anonymity for our contributors, e.g. no personal details are collected and no open IP logging taking place (IP addresses associated with submissions are stored in the DB in an encrypted format).
The problem is that anonymity opens the door to all sorts of nasty surprises - from spam and abuse to fake reports and blackmail campaigns.
How are you guys coping with problems that arise from running anonymous services? Anyone wants to share their experience?