For OpenBazaar, built on IPFS, we've gone the route of federated search with an open API. A DAO could be interesting but a lot more work for little gain.

Eventually I'd like to open source code that lets any user create their own index/search server and potentially charge for usage if they want.

dao=data access object?

You can't implement indexing and search over end to end encrypted data file chunks. You would have to work with the hash of complete files and a localizer, and you want that in the initial design.

Distributed org creates account rents massive file store builds index and use contracts to enforce rental fees.

Thats auper nice