If any multi account holder is working by following all the rules and working fairly then whats wrong?
Nothing wrong as long as they are following the rules. Even you can have multi account on this forum.
why there is btc fee for removing proxy ban?
Means IP ban? May be the admin will know better but IMO I guess it's to punish the IP holder
If this is not legal here then why forum authorities are allowing them to register here?
May be giving a 2nd chance.
tell me that if someone give you negative trust wrongly and not replying you then how to remove that negative trust as well?
Trusts are not moderated. So, the only person can help you is the person who left you the trust.
Let me know if that's satisfactory?