Currently there are many bounty hunters who only use a Newbie account. Which means they have created a new account, maybe not just one.
Lots of people who have multiple accounts.
better in the future, allowed to join the Bounty is a minimum Jr.Member account.
I also often find people who intentionally use my account username to follow the bounty.
Funny as it is, I was once a victim of hack. Someone hacked my bitcointalk account and changed my details. Apparently he intended to sell it, but it was later useless for both of us.
As the op has said, bounties are not what they were intended to be anymore. Imagine twitter for instance, my timeline is usually filled with many useless tweets and retweets which say little or nothing about the project. It's time the whole bounty thing is reshuffled.