I have met the restriction of participants in rare cases. The project is interested in a greater number of quality promotion. I would like to understand how the project will conduct moderation of content for bounty?
I believe it should be limited to preserve the value of bounty shares for every contributor

There can be two options. Either you will spend a very careful selection of high quality content, or you can limit the number of participants. I don't quite understand the whole principle of participation.