1. How influential is this bounty participant for a new project?
It's better than having to pay advertisements to Youtube and Facebook.
If you know the costs incurred for advertising on Facebook and Youtube is very expensive.
2. If the bounty participant is restricted what will affect the success of a new project?
Usually if the limit is because the project already has funds for other ads.
Then also for a small allocation and so that the Bounty Manager is not overwhelmed to handle thousands of participants. LOL