By the way there few bounty hunters only participating in, because they can't handle more bounties because lot of project expecting it's real but in the last it will scam. At the same time many participants making a duplicate on spreadsheets.
Sometimes it just an accident that they duplicate to filled the form but it is often intentional to cheat the bounty campaign . those person that busy with other important thing to do will never think about doing this kind of cheating. but for others that they are doing that kind of work of fraud and cheating its just a normal day for them to do that.
They continue doing this because its beneficial for them .