I looked at the list in the spreadsheet and there were 3 Accounts Connected with the same address but one of them was deleted (Tazmantasik).
each of accounts already has negative trust and I hope accounts like this need to be given a more deterrent effect, I mean banned. Is it possible?
A ban is not possible in cases of multiple accounts cheating on bounties, unless if one of the connected accounts was banned earlier on and the remaining ones were evading ban.
The evidence is more than good enough, so red tags and/or red flags can be left on the profiles by you or any member.