Current situation as you say is happening a lot. The best way to handle this situation is to report to the bounty manager, so they immediately remove the fraudulent object from the spreadsheet to ensure justice to other bounty members.
That's true. there are so many scammers now, we can't avoid them. What we can do is just reporting those scammers to the bounty manager, so the manager will take any action to those irresponsible people.