That's normal to all projects that has an airdrop and bounty. Some of their airdrop and bounty hunters are dumping the coin after listing on some exchanges. I think Tachain will make a solution for it.
Yeah, If those multi account users are using wallet it will be easy to the team to trace them. Here in tachain I think those multi account on the bounty or airdrop will really going to be banned.
At the end we need to see how much % of token are kept for bounty. If it just 2-3% then it's fine I think. Even if all these guys dump tokens after listing, there will not be any issues.
If you have a look on the spreadsheet for the bounty, there are not many participants. At the signature campaign, there are only 19 participants. I don't think that many of them will dump their coins.