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My first approach would be to communities, and community building efforts that are running various contests already. At the same time offering them something beneficial, for example one thing they can interested on is more exposure on their contests. They can be convinced to use steem-bounty for prize distribution, which they already do manually. It is not that difficult to acquire the lists of on-going contests. I can make the list if needed. But they need to be approached.

Another idea, is partnership with dPoll app. Maybe dPoll would be interested in integrating steem-bounty to the polls people make. Win win for both projects.

I don't fully understand the business model for steem-bounty. I should read up more.