How about Bounty hunters avoid such Bounties.
If you see an overcrowded Bounty, the best you can do is just avoid it.
Instead of doing free marketing for projects here and there.
Also, chat up Bounty admins and suggest ways to make Bounties better
Exactly if that bounty had too many participants. You should avoid it and participate in other bounty, it all depends on your decision and no one can give specific rules in this forum. The opportunity is for everyone and it's very fair